Quickly and easily look up the names of all CDNs a website is using. Or do a single URL or hostname lookup!
CDN Performance Checker
Instantly check your CDN for timeouts, errors and caching issues from 10 locations around the globe.
EDNS Client Subnet Checker
Does your CDN support EDNS Client Subnet? Find out with a quick EDNS Client Subnet test.
Initcwnd Checker toolCurrently offline
Quickly measure the initial congestion window (initcwnd) of a CDN (or your web server).