WebCookies logo Web Cookies Scanner

All-in-one free web application security tool. Web application vulnerability and privacy scanner with support for HTTP cookies, Flash, HTML5 localStorage, sessionStorage, CANVAS, Supercookies, Evercookies. Includes a free SSL/TLS, HTML and HTTP vulnerability scanner and URL malware scanner.

Cookie: __cfduid

This cookie name is being set on 16,159 websites and 6,556 distinct domains and we have seen it bein used in the following objects:

  • 16,159 HTTP cookies

Cookie origin and purpose

Below you can find the best information on this cookie we have at this moment. Please note it may be incomplete or inaccurate as there's vast population of cookies out there on the web.

  • CloudFlare cookie (confidence 0.5)

    » Reference...

  • CloudFlare functional cookie set in browsers visiting CloudFlare's customers' websites with the purpose of identifying malicious visitors and reducing the chance of blocking legitimate users (confidence 1.0)

    » Reference...

  • Generic CloudFlare functional cookie (confidence 0.75)

    » Reference...

If you need us to do a more thorough research on this cookie please create a suggestion on Colony.

Cookie classification

  • functional (confidence 0.5)
  • unknown (confidence 0.3)
  • tracking (confidence 0.3)

Sample values

Sample value: 
d0006aede8657fed44bda40c95fc03d1a1595206193
Sample value: 
d0007fc871e0a64b4195fb743fcf083401596748369
Sample value: 
d000a77e325ec046b38a415750e09b0db1570174617

Domains targeted by __cfduid cookie

This list includes both third-party domains set by tracking and adversing companies, as well as the first-party domains of the websites that use this cookie name.

Websites setting __cfduid cookie