__cfduid
Summary
Service
Vendor
Category
Necessary
Description
The _cfduid cookie helps Cloudflare detect malicious visitors to our Customers’ websites and minimizes blocking legitimate users. It may be placed on the devices of our customers' End Users to identify individual clients behind a shared IP address and apply security settings on a per-client basis. It is necessary for supporting Cloudflare's security features.
Expiration
1 day
Popularity
Used on 0.1% websites