__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.

__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.