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CDN Tools

Content delivery network tools like CDN Finder and CDN Performance Checker.

CDN Finder

Quickly and easily look up the names of all CDNs a website is using. Or do a single URL or hostname lookup!

EDNS Client Subnet Checker

Does your CDN support EDNS Client Subnet? Find out with a quick EDNS Client Subnet test.

CDN Performance Checker

Instantly check your CDN for timeouts, errors and caching issues from 10 locations around the globe.

Initcwnd Checker tool

Currently offline

Quickly measure the initial congestion window (initcwnd) of a CDN (or your web server).