3 ms·

I looked a bit closer at their cookies. The two cookies that they send are called "cfduid" and "tdukey". Both of them look like hash values. cfduid seems v

I looked a bit closer at their cookies. The two cookies that they send are called "__cfduid" and "tdukey". Both of them look like hash values. __cfduid seems very random. It changes every time I reload the page. tdukey stays the same. Even when I remove it or use a different browser it comes back to the same value. When I connect through Tor it gets a different value. When I click "new circuit" in Tor it changes to a different value. So it looks like this cookie is a hash of the IP address you connect from.

dogma1138 6y ago
__cfduid is a CloudFlare cookie it’s a randomized hash of your IP address to prevent it from being blocked by other users on the same address. https://support.cloudflare.com/hc/en-us/articles/200170156-Understanding-the-Cloudflare-Cookies#12345682 https://support.cloudflare.com/hc/en-us/articles/200170156-U... TDUkey is likely the one that holds the persistent IP value hash for the randomized one to work correctly.