cs50.io website information.
cs50.io domain name is registered by .IO top-level domain registry. See the other sites registred in .IO domain zone.
Following name servers are specified for cs50.io domain:
- ns-1006.awsdns-61.net
- ns-1163.awsdns-17.org
- ns-1619.awsdns-10.co.uk
- ns-346.awsdns-43.com
and probably website cs50.io is hosted by WIKIMEDIA - Wikimedia Foundation Inc., US web hosting company. Check the complete list of other most popular websites hosted by WIKIMEDIA - Wikimedia Foundation Inc., US hosting company.
According to Alexa traffic rank the highest website cs50.io position was 787963 (in the world). The lowest Alexa rank position was 988416. Now website cs50.io ranked in Alexa database as number 796993 (in the world).
Website cs50.io Desktop speed measurement score (80/100) is better than the results of 69.89% of other sites and shows that the page is performing great on desktop computers.
cs50.io Mobile usability score (89/100) is better than the results of 31.01% of other sites and means that the page is mobile-friendly.
Mobile speed measurement score of cs50.io (56/100) is better than the results of 45.93% of other sites and shows that the landing page performance on mobile devices is poor and can be improved.
Weekly Rank Report
| Date | Rank | Change |
|---|---|---|
| Sep-27-2024 | N/A | N/A |
| Sep-26-2024 | 796,993 | 25,708 |
| Sep-25-2024 | 822,701 | -30,035 |
| Sep-24-2024 | 792,666 | 4,228 |
| Sep-23-2024 | 796,894 | 33,931 |
| Sep-22-2024 | 830,825 | -26,327 |
| Sep-21-2024 | 804,498 | -9,250 |
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cs50.io 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.
cs50.io 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: cs50.io
Registry Domain ID: 9ced70f066734096ab2c192e757e6ec8-DONUTS
Registrar WHOIS Server: key-systems.net
Registrar URL: http://key-systems.net
Updated Date: 2021-07-09T09:33:50Z
Creation Date: 2011-09-07T06:56:11Z
Registry Expiry Date: 2022-09-07T06:56:11Z
Registrar: Key-Systems GmbH
Registrar IANA ID: 269
Registrar Abuse Contact Email: abuse@key-systems.net
Registrar Abuse Contact Phone: +49 6894 9396 850
Domain Status: ok https://icann.org/epp#ok
Registry Registrant ID: REDACTED FOR PRIVACY
Registrant Name: REDACTED FOR PRIVACY
Registrant Organization: Harvard
Registrant Street: REDACTED FOR PRIVACY
Registrant City: REDACTED FOR PRIVACY
Registrant State/Province: MA
Registrant Postal Code: REDACTED FOR PRIVACY
Registrant Country: US
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Registrant Email: Please query the RDDS service of the Registrar of Record identified in this output for information on how to contact the Registrant, Admin, or Tech contact of the queried domain name.
Registry Admin ID: REDACTED FOR PRIVACY
Admin Name: REDACTED FOR PRIVACY
Admin Organization: REDACTED FOR PRIVACY
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Admin Email: Please query the RDDS service of the Registrar of Record identified in this output for information on how to contact the Registrant, Admin, or Tech contact of the queried domain name.
Registry Tech ID: REDACTED FOR PRIVACY
Tech Name: REDACTED FOR PRIVACY
Tech Organization: REDACTED FOR PRIVACY
Tech Street: REDACTED FOR PRIVACY
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Tech Fax Ext: REDACTED FOR PRIVACY
Tech Email: Please query the RDDS service of the Registrar of Record identified in this output for information on how to contact the Registrant, Admin, or Tech contact of the queried domain name.
Name Server: ns-1160.awsdns-17.org
Name Server: ns-1873.awsdns-42.co.uk
Name Server: ns-241.awsdns-30.com
Name Server: ns-517.awsdns-00.net
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of WHOIS database: 2022-04-17T18:50:28Z
cs50.io server information
cs50.io desktop page speed rank
Last tested: 2017-05-21
cs50.io Desktop Speed Test Quick Summary
priority - 12 Avoid landing page redirects
Your page has 3 redirects. Redirects introduce additional delays before the page can be loaded.
Avoid landing page redirects for the following chain of redirected URLs.
https://cs50.io/
https://cs50.io/auth/cs50?r=%2Fopen%3FworkspaceTyp…E%26selection_file%3Dx
https://id.cs50.net/authorize?state=foo&response_t…20email&client_id=prod
priority - 10 Eliminate render-blocking JavaScript and CSS in above-the-fold content
Your page has 3 blocking script resources and 2 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:
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js
https://id.cs50.net/js/scripts.js
Optimize CSS Delivery of the following:
https://id.cs50.net/css/styles.css
priority - 1 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:
https://id.cs50.net/js/scripts.js (expiration not specified)
cs50.io Desktop Resources
| Total Resources | 9 |
| Number of Hosts | 4 |
| Static Resources | 5 |
| JavaScript Resources | 3 |
| CSS Resources | 2 |
cs50.io Desktop Resource Breakdown
cs50.io mobile page speed rank
Last tested: 2017-05-21
cs50.io Mobile Speed Test Quick Summary
priority - 43 Avoid landing page redirects
Your page has 3 redirects. Redirects introduce additional delays before the page can be loaded.
Avoid landing page redirects for the following chain of redirected URLs.
https://cs50.io/
https://cs50.io/auth/cs50?r=%2Fopen%3FworkspaceTyp…E%26selection_file%3Dx
https://id.cs50.net/authorize?state=foo&response_t…20email&client_id=prod
priority - 40 Eliminate render-blocking JavaScript and CSS in above-the-fold content
Your page has 3 blocking script resources and 2 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:
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js
https://id.cs50.net/js/scripts.js
Optimize CSS Delivery of the following:
https://id.cs50.net/css/styles.css
priority - 2 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:
https://id.cs50.net/js/scripts.js (expiration not specified)
cs50.io Mobile Resources
| Total Resources | 9 |
| Number of Hosts | 4 |
| Static Resources | 5 |
| JavaScript Resources | 3 |
| CSS Resources | 2 |
cs50.io Mobile Resource Breakdown
cs50.io mobile page usability
Last tested: 2017-05-21
cs50.io Mobile Usability Test Quick Summary
priority - 10 Configure the viewport
Your page does not have a viewport specified. This causes mobile devices to render your page as it would appear on a desktop browser, scaling it down to fit on a mobile screen. Configure a viewport to allow your page to render properly on all devices.
Configure a viewport for this page.
priority - 0 Use legible font sizes
The following text on your page renders in a way that may be difficult for some of your visitors to read. Use legible font sizes to provide a better user experience.
The following text fragments have a small font size. Increase the font size to make them more legible.
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cs50.io 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.
cs50.io 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.