21IC.COM 21IC中国电子网 - 中国电子工程师的首选网站


21ic.com website information.

21ic.com domain name is registered by .COM top-level domain registry. See the other sites registred in .COM domain zone.

Following name servers are specified for 21ic.com domain:

  • dns2.hichina.com
  • dns1.hichina.com

and probably website 21ic.com is hosted by TWITTER - Twitter Inc., US web hosting company. Check the complete list of other most popular websites hosted by TWITTER - Twitter Inc., US hosting company.

According to Alexa traffic rank the highest website 21ic.com position was 1233 (in the world). The lowest Alexa rank position was 907095. Now website 21ic.com ranked in Alexa database as number 42360 (in the world).

Website 21ic.com Desktop speed measurement score (42/100) is better than the results of 16.45% of other sites shows that the page desktop performance can be improved.

21ic.com Mobile usability score (83/100) is better than the results of 26.4% of other sites and means that the page is mobile-friendly.

Mobile speed measurement score of 21ic.com (53/100) is better than the results of 39.51% of other sites and shows that the landing page performance on mobile devices is poor and can be improved.

Weekly Rank Report

DateRankChange
Mar-28-2024 42,360142
Mar-27-2024 42,502-163
Mar-26-2024 42,339266
Mar-25-2024 42,605-66
Mar-24-2024 42,539-408
Mar-23-2024 42,131140
Mar-22-2024 42,271199

Advertisement

21ic.com Rank History

Alexa can identify the popularity of a website as well as its competitors. It is important for website owners and bloggers to know their Alexa ranking because it shows how many visitors have viewed their web page. It gives them a clear idea of how popular their website is on the internet and the ranking of their competitors.



21ic.com whois

WHOIS is a query and response protocol that is widely used for querying databases that store the registered users or assignees of an Internet resource, such as a domain name, an IP address block, or an autonomous system, but is also used for a wider range of other information.


Domain Name: 21IC.COM
Registry Domain ID: 17040411_DOMAIN_COM-VRSN
Registrar WHOIS Server: grs-whois.hichina.com
Registrar URL: http://www.net.cn
Updated Date: 2018-07-30T07:41:06Z
Creation Date: 2000-01-10T02:41:29Z
Registry Expiry Date: 2022-01-10T02:41:29Z
Registrar: Alibaba Cloud Computing (Beijing) Co., Ltd.
Registrar IANA ID: 420
Registrar Abuse Contact Email: DomainAbuse@service.aliyun.com
Registrar Abuse Contact Phone: +86.95187
Domain Status: ok https://icann.org/epp#ok
Name Server: DNS1.HICHINA.COM
Name Server: DNS2.HICHINA.COM
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2021-04-25T07:28:49Z

21ic.com server information

Servers Location

IP Address
39.107.224.126
Country
China
Region
Zhejiang
City
Hangzhou

21ic.com desktop page speed rank

Last tested: 2018-02-01


Desktop Speed Bad
42/100

21ic.com Desktop Speed Test Quick Summary


priority - 70 Optimize images

Properly formatting and compressing images can save many bytes of data.

Optimize the following images to reduce their size by 684.6KiB (55% reduction).

Compressing http://misc.21ic.com/homepage2016/images/home_icon.png could save 177KiB (55% reduction).
Compressing https://s0.2mdn.net/6960728/21IC_Compensation_Mosf…eferenceDesign_Jan.jpg could save 62.1KiB (72% reduction).
Compressing http://www.21ic.com/d/file/201509/d975bd233ad32af52a7b82f2e0cf5be8.jpg could save 32.2KiB (57% reduction).
Compressing http://www.21ic.com/d/file/201801/cb8eb88ad2e099ac13f85a4a9f08739f.jpg could save 28.4KiB (50% reduction).
Compressing http://www.21ic.com/d/file/201801/db72a25c0983dfc86325363d571838d3.jpg could save 28.1KiB (54% reduction).
Compressing http://img.21ic.com/customery/Mouser/201801/Infine…4800--950x60-c--sc.jpg could save 27.5KiB (60% reduction).
Compressing http://img.21ic.com/customery/TI/20140604/deyisupport_238x200.jpg could save 19.8KiB (53% reduction).
Compressing http://img.21ic.com/customery/ST/201710/stm32_360x…10(10-24-15-34-41).jpg could save 18.7KiB (50% reduction).
Compressing http://misc.21ic.com/pub/topbar/images/ghs.png could save 17.4KiB (92% reduction).
Compressing http://img.21ic.com/customery/ad/20140529/deyisupport_468x60.jpg could save 14.1KiB (52% reduction).
Compressing http://img.21ic.com/2015nav/images/bbs06_mu_logo.jpg could save 13.8KiB (88% reduction).
Compressing and resizing http://www.21ic.com/d/file/201801/f52ec87d1b9a0dabd5cc4c5c6d62fe43.jpg could save 13.3KiB (77% reduction).
Compressing http://img.21ic.com/2015nav/images/bbs04_me_logo.jpg could save 12.7KiB (89% reduction).
Compressing http://img.21ic.com/2015nav/images/bbs10_zh_logo.jpg could save 12.3KiB (90% reduction).
Compressing http://img.21ic.com/2015nav/images/bbs07_st_logo.jpg could save 11.9KiB (90% reduction).
Compressing http://img.21ic.com/2015nav/images//bbs08_ti_logo.jpg could save 11.8KiB (88% reduction).
Compressing http://misc.21ic.com/2015nav/images//arrow01.jpg could save 11.6KiB (96% reduction).
Compressing http://img.21ic.com/2015nav/images/bbs_button_boke.jpg could save 11.6KiB (90% reduction).
Compressing http://img.21ic.com/2015nav/images/bbs03_gi_logo.jpg could save 11KiB (90% reduction).
Compressing http://img.21ic.com/customery/ad/201712/468x61-1206.jpg could save 10.7KiB (50% reduction).
Compressing http://img.21ic.com/2015nav/images/bbs_button.jpg could save 10.5KiB (90% reduction).
Compressing http://img.21ic.com/customery/ChipON/20160503/chipon-ic_386x130.jpg could save 8KiB (34% reduction).
Compressing http://misc.21ic.com/2015nav/images//bbs_bg.jpg could save 7.6KiB (95% reduction).
Compressing http://misc.21ic.com/homepage2016/images/code_web.jpg could save 7.4KiB (60% reduction).
Compressing http://img.21ic.com/customery/ad/201712/210x60-1206.jpg could save 7.4KiB (51% reduction).
Compressing http://www.21ic.com/d/file/201801/28bbffa09ce39fa14c517a1a6675b297.jpg could save 7.3KiB (22% reduction).
Compressing http://img.21ic.com/customery/ad/201801/236x60.jpg could save 6.1KiB (51% reduction).
Compressing http://img.21ic.com/customery/meeting/2018/0307/home_seminar0307_will.jpg could save 6KiB (36% reduction).
Compressing http://misc.21ic.com/2015nav/images//data_bg.jpg could save 6KiB (80% reduction).
Compressing http://img.21ic.com/customery/ad/201710/dl_event_468x60.jpg could save 5.4KiB (33% reduction).
Compressing http://misc.21ic.com/homepage2016/images/bbslogo_chipon.jpg could save 5.4KiB (68% reduction).
Compressing http://www.21ic.com/images/PWR200x80.jpg could save 5.2KiB (49% reduction).
Compressing http://misc.21ic.com/homepage2016/images/code_magazine.jpg could save 5.1KiB (50% reduction).
Compressing http://misc.21ic.com/2015nav/images//nav_bg.jpg could save 4KiB (75% reduction).
Compressing http://img.21ic.com/customery/tek/201801/758x60-0123.jpg could save 3.1KiB (18% reduction).
Compressing http://www.21ic.com/images/zhaopin_570x90.jpg could save 3KiB (20% reduction).
Compressing http://misc.21ic.com/homepage2016/images/footer_btn2.jpg could save 2.9KiB (63% reduction).
Compressing http://misc.21ic.com/homepage2016/images/footer_btn1.jpg could save 2.8KiB (60% reduction).
Compressing http://misc.21ic.com/homepage2016/images/mini_logo10.jpg could save 2.7KiB (59% reduction).
Compressing http://www.21ic.com/d/file/201802/b45e0be3210aafbb46011eb4e2f9cb70.jpg could save 2.6KiB (25% reduction).
Compressing http://misc.21ic.com/homepage2016/images/mini_logo2.jpg could save 2.6KiB (62% reduction).
Compressing http://img.21ic.com/customery/origin/origin_386x130.jpg could save 2.5KiB (15% reduction).
Compressing http://img.21ic.com/2015nav/images/data_button.jpg could save 2.2KiB (71% reduction).
Compressing http://misc.21ic.com/homepage2016/images/toolbar.png could save 1.7KiB (19% reduction).
Compressing http://misc.21ic.com/homepage2016/images/search_btn.jpg could save 1.7KiB (66% reduction).
Compressing http://misc.21ic.com/homepage2016/images/mini_logo9.jpg could save 1.5KiB (52% reduction).
Compressing http://misc.21ic.com/homepage2016/images/mini_logo8.jpg could save 1.4KiB (50% reduction).
Compressing http://misc.21ic.com/homepage2016/images/mini_logo3.jpg could save 1.4KiB (50% reduction).
Compressing http://www.21ic.com/d/file/201802/354e6411b40c14844d1ed39db2ff78d8.jpg could save 1.2KiB (15% reduction).
Compressing http://www.21ic.com/toshiba/images/icon_arrow_s1.gif could save 1.1KiB (88% reduction).
Compressing http://www.21ic.com/ti/deyisupport/images/main_r_more.jpg could save 1.1KiB (62% reduction).
Compressing http://www.21ic.com/toshiba/images/icon_arrow.gif could save 1.1KiB (75% reduction).
Compressing http://www.21ic.com/rohm/images/item_conbg.jpg could save 1.1KiB (79% reduction).
Compressing http://www.21ic.com/adi/images1/list1_title4.gif could save 1KiB (49% reduction).
Compressing http://www.21ic.com/adi/images1/list1_title1.gif could save 1,015B (49% reduction).
Compressing http://misc.21ic.com/2015nav/images//jishu_bg.jpg could save 907B (73% reduction).
Compressing http://img.21ic.com/logo.jpg could save 778B (16% reduction).
Compressing http://misc.21ic.com/homepage2016/images/search_select.jpg could save 770B (53% reduction).
Compressing http://misc.21ic.com/homepage2016/images/code_embed.jpg could save 723B (12% reduction).
Compressing http://misc.21ic.com/homepage2016/images/code_power.jpg could save 718B (12% reduction).
Compressing http://img.21ic.com/2015nav/images/bbs01_cy_logo.jpg could save 629B (24% reduction).
Compressing http://misc.21ic.com/homepage2016/images/title__sel.jpg could save 613B (46% reduction).
Compressing http://misc.21ic.com/homepage2016/images/mini_logo5.jpg could save 565B (26% reduction).
Compressing http://www.21ic.com/microchip/images/more.jpg could save 433B (41% reduction).
Compressing http://misc.21ic.com/homepage2016/images/st_logo.jpg could save 371B (25% reduction).
Compressing http://misc.21ic.com/homepage2016/images/more.jpg could save 349B (40% reduction).
Compressing http://img.21ic.com/2015nav/images/bbs12_navota_logo.jpg could save 297B (16% reduction).
Compressing http://www.21ic.com/st/f7/img/arrow.jpg could save 231B (41% reduction).
Compressing http://misc.21ic.com/homepage2016/images/home_ststar.png could save 157B (31% reduction).
Compressing http://misc.21ic.com/homepage2016/images/home_st.png could save 117B (26% reduction).
Compressing http://www.21ic.com/microchip/images/arrow.jpg could save 109B (25% reduction).

priority - 49 Leverage browser caching

Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.

Leverage browser caching for the following cacheable resources:

http://img.21ic.com/2015nav/images//bbs08_ti_logo.jpg (expiration not specified)
http://img.21ic.com/2015nav/images/bbs.gif (expiration not specified)
http://img.21ic.com/2015nav/images/bbs01_cy_logo.jpg (expiration not specified)
http://img.21ic.com/2015nav/images/bbs03_gi_logo.jpg (expiration not specified)
http://img.21ic.com/2015nav/images/bbs04_me_logo.jpg (expiration not specified)
http://img.21ic.com/2015nav/images/bbs06_mu_logo.jpg (expiration not specified)
http://img.21ic.com/2015nav/images/bbs07_st_logo.jpg (expiration not specified)
http://img.21ic.com/2015nav/images/bbs10_zh_logo.jpg (expiration not specified)
http://img.21ic.com/2015nav/images/bbs12_navota_logo.jpg (expiration not specified)
http://img.21ic.com/2015nav/images/bbs13_xs_logo.jpg (expiration not specified)
http://img.21ic.com/2015nav/images/bbs_button.jpg (expiration not specified)
http://img.21ic.com/2015nav/images/bbs_button_boke.jpg (expiration not specified)
http://img.21ic.com/2015nav/images/data_button.jpg (expiration not specified)
http://img.21ic.com/2015nav/images/huod.gif (expiration not specified)
http://img.21ic.com/2015nav/images/nav_uparrow.gif (expiration not specified)
http://img.21ic.com/customery/ChipON/20160503/chipon-ic_386x130.jpg (expiration not specified)
http://img.21ic.com/customery/Mouser/201801/Infine…4800--950x60-c--sc.jpg (expiration not specified)
http://img.21ic.com/customery/NI/201706/ban_lv_evergreen_210x150.gif (expiration not specified)
http://img.21ic.com/customery/ST/201710/stm32_360x…10(10-24-15-34-41).jpg (expiration not specified)
http://img.21ic.com/customery/ST/201801/Training-M…wnloadTOS-468-X-60.gif (expiration not specified)
http://img.21ic.com/customery/TI/20140604/deyisupport_238x200.jpg (expiration not specified)
http://img.21ic.com/customery/ad/20140529/deyisupport_468x60.jpg (expiration not specified)
http://img.21ic.com/customery/ad/201710/dl_event_468x60.jpg (expiration not specified)
http://img.21ic.com/customery/ad/201712/210x60-1206.jpg (expiration not specified)
http://img.21ic.com/customery/ad/201712/468x61-1206.jpg (expiration not specified)
http://img.21ic.com/customery/ad/201801/236x60.jpg (expiration not specified)
http://img.21ic.com/customery/chuangwei/21icgif-new-0704.gif (expiration not specified)
http://img.21ic.com/customery/cypress/201712/cypress386x130-2017.gif (expiration not specified)
http://img.21ic.com/customery/meeting/2018/0307/home_seminar0307_will.jpg (expiration not specified)
http://img.21ic.com/customery/origin/origin_386x130.jpg (expiration not specified)
http://img.21ic.com/customery/rigol/210X150-1219.gif (expiration not specified)
http://img.21ic.com/customery/tek/201801/758x60-0123.jpg (expiration not specified)
http://img.21ic.com/customery/toshiba/201801/468x60-1-0131.gif (expiration not specified)
http://img.21ic.com/logo.jpg (expiration not specified)
http://misc.21ic.com/2015nav/images//arrow01.jpg (expiration not specified)
http://misc.21ic.com/2015nav/images//bbs_bg.jpg (expiration not specified)
http://misc.21ic.com/2015nav/images//data_bg.jpg (expiration not specified)
http://misc.21ic.com/2015nav/images//jishu_bg.jpg (expiration not specified)
http://misc.21ic.com/2015nav/images//nav_bg.jpg (expiration not specified)
http://misc.21ic.com/2015nav/js/lrtk.js (expiration not specified)
http://misc.21ic.com/2015nav/js/slide-nav.js (expiration not specified)
http://misc.21ic.com/homepage2016/css/2016microsite1.css (expiration not specified)
http://misc.21ic.com/homepage2016/css/2017global2.css (expiration not specified)
http://misc.21ic.com/homepage2016/css/2017home1.css (expiration not specified)
http://misc.21ic.com/homepage2016/css/index_nav2.css (expiration not specified)
http://misc.21ic.com/homepage2016/images/bbslogo_chipon.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/code_embed.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/code_magazine.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/code_power.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/code_web.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/footer_btn1.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/footer_btn2.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/footerbg.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/home_icon.gif (expiration not specified)
http://misc.21ic.com/homepage2016/images/home_icon.png (expiration not specified)
http://misc.21ic.com/homepage2016/images/home_st.png (expiration not specified)
http://misc.21ic.com/homepage2016/images/home_ststar.png (expiration not specified)
http://misc.21ic.com/homepage2016/images/loading210_120.gif (expiration not specified)
http://misc.21ic.com/homepage2016/images/loading280_180.gif (expiration not specified)
http://misc.21ic.com/homepage2016/images/micro_pi_01.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/micro_pi_02.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/micro_pi_03.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/micro_pi_04.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/micro_pi_05.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/micro_pi_06.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/mini_logo10.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/mini_logo2.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/mini_logo21.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/mini_logo3.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/mini_logo5.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/mini_logo7.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/mini_logo8.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/mini_logo9.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/more.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/rohm_arrow.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/search_btn.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/search_select.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/st_logo.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/title__libg.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/title__sel.jpg (expiration not specified)
http://misc.21ic.com/homepage2016/images/toolbar.png (expiration not specified)
http://misc.21ic.com/homepage2016/js/bigpicroll.js (expiration not specified)
http://misc.21ic.com/homepage2016/js/function.js (expiration not specified)
http://misc.21ic.com/homepage2016/js/home.js (expiration not specified)
http://misc.21ic.com/homepage2016/js/jquery-1.11.0.min.js (expiration not specified)
http://misc.21ic.com/homepage2016/js/jquery-migrate-1.2.1.min.js (expiration not specified)
http://misc.21ic.com/homepage2016/js/jquery.lazyload.min.js (expiration not specified)
http://misc.21ic.com/homepage2016/js/slides.min.jquery.js (expiration not specified)
http://misc.21ic.com/homepage2016/js/uaredirect.js (expiration not specified)
http://misc.21ic.com/pub/topbar/images/ghs.png (expiration not specified)
http://misc.21ic.com/pub/topbar/js/cs_gbk.js (expiration not specified)
http://misc.21ic.com/pub/topbar/js/jquery-1.7.2.min.js (expiration not specified)
http://tj.21ic.com/sn.js (expiration not specified)
http://1.sunrtb.cn/b/ant_flash.js (60 seconds)
http://pagead2.googlesyndication.com/pagead/js/lidar.js (60 minutes)
https://pagead2.googlesyndication.com/pagead/js/lidar.js (60 minutes)
https://www.googletagservices.com/dcm/dcmads.js (60 minutes)
http://www.google-analytics.com/ga.js (2 hours)

priority - 20 Enable compression

Compressing resources with gzip or deflate can reduce the number of bytes sent over the network.

Enable compression for the following resources to reduce their transfer size by 191.2KiB (66% reduction).

Compressing http://misc.21ic.com/homepage2016/js/jquery-1.11.0.min.js could save 61.5KiB (65% reduction).
Compressing http://misc.21ic.com/pub/topbar/js/jquery-1.7.2.min.js could save 59.8KiB (64% reduction).
Compressing http://1.sunrtb.cn/b/ant_flash.js could save 35.1KiB (70% reduction).
Compressing http://misc.21ic.com/homepage2016/js/slides.min.jquery.js could save 14.4KiB (84% reduction).
Compressing http://misc.21ic.com/homepage2016/js/home.js could save 4.4KiB (74% reduction).
Compressing http://misc.21ic.com/homepage2016/js/jquery-migrate-1.2.1.min.js could save 4KiB (57% reduction).
Compressing http://misc.21ic.com/homepage2016/js/function.js could save 3.4KiB (63% reduction).
Compressing http://misc.21ic.com/2015nav/js/slide-nav.js could save 2.5KiB (66% reduction).
Compressing http://misc.21ic.com/homepage2016/js/jquery.lazyload.min.js could save 2KiB (61% reduction).
Compressing http://misc.21ic.com/2015nav/js/lrtk.js could save 1.5KiB (66% reduction).
Compressing http://misc.21ic.com/homepage2016/js/bigpicroll.js could save 1.3KiB (62% reduction).
Compressing http://misc.21ic.com/pub/topbar/js/cs_gbk.js could save 914B (69% reduction).
Compressing http://misc.21ic.com/homepage2016/js/uaredirect.js could save 376B (46% reduction).

priority - 10 Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 8 blocking script resources and 3 blocking CSS resources. This causes a delay in rendering your page.

None of the above-the-fold content on your page could be rendered without waiting for the following resources to load. Try to defer or asynchronously load blocking resources, or inline the critical portions of those resources directly in the HTML.

Remove render-blocking JavaScript:

http://misc.21ic.com/homepage2016/js/uaredirect.js
http://misc.21ic.com/homepage2016/js/function.js
http://misc.21ic.com/homepage2016/js/home.js
http://misc.21ic.com/homepage2016/js/jquery-1.11.0.min.js
http://misc.21ic.com/homepage2016/js/jquery-migrate-1.2.1.min.js
http://misc.21ic.com/pub/topbar/js/jquery-1.7.2.min.js
http://misc.21ic.com/2015nav/js/slide-nav.js
http://misc.21ic.com/2015nav/js/lrtk.js

Optimize CSS Delivery of the following:

http://misc.21ic.com/homepage2016/css/2017global2.css
http://misc.21ic.com/homepage2016/css/2017home1.css
http://misc.21ic.com/homepage2016/css/index_nav2.css

priority - 2 Minify JavaScript

Compacting JavaScript code can save many bytes of data and speed up downloading, parsing, and execution time.

Minify JavaScript for the following resources to reduce their size by 16.3KiB (43% reduction).

Minifying http://misc.21ic.com/homepage2016/js/slides.min.jquery.js could save 9.6KiB (56% reduction).
Minifying http://misc.21ic.com/2015nav/js/slide-nav.js could save 2.5KiB (68% reduction).
Minifying http://misc.21ic.com/homepage2016/js/home.js could save 1.5KiB (26% reduction).
Minifying http://misc.21ic.com/homepage2016/js/function.js could save 939B (18% reduction).
Minifying http://misc.21ic.com/2015nav/js/lrtk.js could save 903B (39% reduction).
Minifying http://misc.21ic.com/homepage2016/js/bigpicroll.js could save 680B (32% reduction).
Minifying http://tj.21ic.com/sn.js could save 266B (15% reduction) after compression.

priority - 1 Minify HTML

Compacting HTML code, including any inline JavaScript and CSS contained in it, can save many bytes of data and speed up download and parse times.

Minify HTML for the following resources to reduce their size by 5.3KiB (13% reduction).

Minifying http://www.21ic.com/ could save 5.3KiB (13% reduction) after compression.

priority - 0 Minify CSS

Compacting CSS code can save many bytes of data and speed up download and parse times.

Minify CSS for the following resources to reduce their size by 3.4KiB (23% reduction).

Minifying http://misc.21ic.com/homepage2016/css/2016microsite1.css could save 2.5KiB (36% reduction) after compression.
Minifying http://misc.21ic.com/homepage2016/css/index_nav2.css could save 591B (12% reduction) after compression.
Minifying http://misc.21ic.com/homepage2016/css/2017global2.css could save 326B (12% reduction) after compression.

21ic.com Desktop Resources

Total Resources164
Number of Hosts15
Static Resources125
JavaScript Resources26
CSS Resources4

21ic.com Desktop Resource Breakdown

21ic.com mobile page speed rank

Last tested: 2017-05-30


Mobile Speed Bad
53/100

21ic.com Mobile Speed Test Quick Summary


priority - 26 Enable compression

Compressing resources with gzip or deflate can reduce the number of bytes sent over the network.

Enable compression for the following resources to reduce their transfer size by 251.1KiB (70% reduction).

Compressing http://m.21ic.com/js/jquery.js could save 187.6KiB (70% reduction).
Compressing http://1.sunrtb.cn/b/ant_flash.js could save 35.1KiB (70% reduction).
Compressing http://m.21ic.com/css/public.css could save 16.1KiB (76% reduction).
Compressing http://m.21ic.com/ could save 5.5KiB (67% reduction).
Compressing http://m.21ic.com/js/pull.js could save 2.7KiB (68% reduction).
Compressing http://m.21ic.com/js/js.js could save 1.5KiB (68% reduction).
Compressing http://m.21ic.com/js/jquery.rotate.js could save 951B (62% reduction).
Compressing http://m.21ic.com/load?rd=0.19426893815398216&page…05-30&order=1%7C2&ba=2 could save 652B (65% reduction).
Compressing http://m.21ic.com/js/common.js could save 588B (52% reduction).
Compressing http://m.21ic.com/js/navibar.php could save 535B (50% reduction).

priority - 26 Avoid landing page redirects

Your page has 2 redirects. Redirects introduce additional delays before the page can be loaded.

Avoid landing page redirects for the following chain of redirected URLs.

http://21ic.com/
http://www.21ic.com/
http://m.21ic.com/

priority - 16 Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 1 blocking script resources and 1 blocking CSS resources. This causes a delay in rendering your page.

None of the above-the-fold content on your page could be rendered without waiting for the following resources to load. Try to defer or asynchronously load blocking resources, or inline the critical portions of those resources directly in the HTML.

Remove render-blocking JavaScript:

http://m.21ic.com/js/navibar.php

Optimize CSS Delivery of the following:

http://m.21ic.com/css/public.css

priority - 13 Minify JavaScript

Compacting JavaScript code can save many bytes of data and speed up downloading, parsing, and execution time.

Minify JavaScript for the following resources to reduce their size by 127.8KiB (47% reduction).

Minifying http://m.21ic.com/js/jquery.js could save 125KiB (47% reduction).
Minifying http://m.21ic.com/js/pull.js could save 1.4KiB (36% reduction).
Minifying http://m.21ic.com/js/jquery.rotate.js could save 768B (50% reduction).
Minifying http://m.21ic.com/js/js.js could save 757B (34% reduction).

priority - 8 Leverage browser caching

Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.

Leverage browser caching for the following cacheable resources:

http://m.21ic.com/js/checklogin.js (expiration not specified)
http://m.21ic.com/js/common.js (expiration not specified)
http://m.21ic.com/js/jquery.js (expiration not specified)
http://m.21ic.com/js/jquery.rotate.js (expiration not specified)
http://m.21ic.com/js/js.js (expiration not specified)
http://m.21ic.com/js/navi.js (expiration not specified)
http://m.21ic.com/js/navibar.php (expiration not specified)
http://m.21ic.com/js/pull.js (expiration not specified)
http://1.sunrtb.cn/b/ant_flash.js (60 seconds)
http://pagead2.googlesyndication.com/pagead/js/lidar.js (60 minutes)
https://www.googletagservices.com/dcm/dcmads.js (60 minutes)

priority - 6 Optimize images

Properly formatting and compressing images can save many bytes of data.

Optimize the following images to reduce their size by 57.1KiB (43% reduction).

Compressing https://s1.2mdn.net/5281214/360x640_JXD-Series_CN.jpg could save 30.8KiB (35% reduction).
Compressing https://s0.2mdn.net/4444862/360x70_low-jitter-oscillators_CN.jpg could save 20.6KiB (67% reduction).
Compressing http://m.21ic.com/images/icon_top.png could save 1.2KiB (51% reduction).
Compressing http://m.21ic.com/images/logo.png could save 1,000B (21% reduction).
Compressing http://m.21ic.com/images/icon_search.png could save 943B (51% reduction).
Compressing http://m.21ic.com/images/icon_refresh.png could save 915B (57% reduction).
Compressing http://m.21ic.com/images/icon_uc.png could save 886B (48% reduction).
Compressing http://m.21ic.com/images/icon_dots.png could save 884B (71% reduction).

priority - 0 Minify CSS

Compacting CSS code can save many bytes of data and speed up download and parse times.

Minify CSS for the following resources to reduce their size by 2.2KiB (11% reduction).

Minifying http://m.21ic.com/css/public.css could save 2.2KiB (11% reduction).

priority - 0 Minify HTML

Compacting HTML code, including any inline JavaScript and CSS contained in it, can save many bytes of data and speed up download and parse times.

Minify HTML for the following resources to reduce their size by 1.7KiB (22% reduction).

Minifying http://m.21ic.com/ could save 1.7KiB (22% reduction).

21ic.com Mobile Resources

Total Resources43
Number of Hosts13
Static Resources23
JavaScript Resources19
CSS Resources1

21ic.com Mobile Resource Breakdown

21ic.com mobile page usability

Last tested: 2017-05-30


Mobile Usability Medium
83/100

21ic.com Mobile Usability Test Quick Summary


priority - 18 Size tap targets appropriately

Some of the links/buttons on your webpage may be too small for a user to easily tap on a touchscreen. Consider making these tap targets larger to provide a better user experience.

The following tap targets are close to other nearby tap targets and may need additional spacing around them.

The tap target <div id="DfaVisibilityI…ier_3222191668" class="GoogleActiveViewClass"></div> is close to 1 other tap targets.

The tap target <a href="https://adclic…nector-modules"></a> is close to 1 other tap targets.

The tap target <a id="account" href="http://my.21ic.com" class="btn_goucenter"></a> is close to 2 other tap targets.

The tap target <a href="javascript:;void(0)" class="btn_refresh"></a> is close to 1 other tap targets.

The tap target <a href="/searchform" class="btn_gosearch"></a> is close to 3 other tap targets.

The tap target <a id="cat35" href="http://open.21ic.com/m/">公开课</a> is close to 3 other tap targets.

The tap target <a href="/menu.htm"></a> is close to 3 other tap targets.

The tap target <a href="http://bbs.21i…20516-1-1.html" class="news_title">绕高频变压器求助</a> and 6 others are close to other tap targets.

The tap target <a href="http://bbs.21ic.com/" class="news_column">论坛</a> and 8 others are close to other tap targets.

The tap target <div id="DfaVisibilityI…ier_1402900042" class="GoogleActiveViewClass"></div> is close to 2 other tap targets.

The tap target <a href="https://adclic…er-oscillators"></a> is close to 2 other tap targets.

The tap target <a href="http://my.21ic.com/logging.php">登录</a> and 1 others are close to other tap targets.

The tap target <a href="http://www.21ic.com" class="last_footerlink">电脑版</a> is close to 1 other tap targets.

21ic.com similar domains

Similar domains:
www.21ic.com
www.21ic.net
www.21ic.org
www.21ic.info
www.21ic.biz
www.21ic.us
www.21ic.mobi
www.1ic.com
www.21ic.com
www.2ic.com
www.21c.com
www.21uc.com
www.21iuc.com
www.21uic.com
www.21jc.com
www.21ijc.com
www.21jic.com
www.21kc.com
www.21ikc.com
www.21kic.com
www.21oc.com
www.21ioc.com
www.21oic.com
www.21i.com
www.21ix.com
www.21icx.com
www.21ixc.com
www.21id.com
www.21icd.com
www.21idc.com
www.21if.com
www.21icf.com
www.21ifc.com
www.21iv.com
www.21icv.com
www.21ivc.com
www.21ic.con

21ic.com Ping

Ping is a networking utility tool to test if a particular host is reachable. It is a diagnostic that checks reachability of a host on an Internet Protocol (IP) network. In a computer network, a ping test is a way of sending messages from one host to another. Aside from checking if the host is connected to a network, ping also gives indicators of the reliability and general speed of the connection.


21ic.com TRACEROUTE

Traceroute is a network diagnostic tool used to track the pathway taken by a packet on an IP network from source to destination. Traceroute also records the time taken for each hop the packet makes during its route to the destination. Traceroute uses ICMP (Internet Control Message Protocol) echo packets with variable time to live values. The response time of each hop is calculated. To guarantee accuracy, each hop is queried multiple times (usually three times) to better measure the response of that particular hop.