This cookie name is being set on 315,300 websites and 72,244 distinct domains and we have seen it bein used in the following objects:

315,300 HTTP cookies

Cookie origin and purpose

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...

Cookie classification

unknown (confidence 0.5)
tracking (confidence 0.5)

Sample values

Sample value:

Bit length: 0
Shannon entropy: average 0.00 bits per byte
Information content: 0.00 bits

Sample value:

d00013c1da9ba5c788a53f2cbb2acb9891499444259

This cookie seems to be a hexadecimal-encoded data. Attempted decoded value:

b'\x00\x01<\x1d\xa9\xba\\x\x8aS\xf2\xcb\xb2\xac\xb9\x89\x14\x99DBY'

Bit length: 168
Shannon entropy: average 4.39 bits per byte
Information content: 92.24 bits

Sample value:

d000141d6d57af9ce03d7049fc7369f8e1533208733

This cookie seems to be a hexadecimal-encoded data. Attempted decoded value:

b'\x00\x01A\xd6\xd5z\xf9\xce\x03\xd7\x04\x9f\xc76\x9f\x8e\x153 \x873'

Bit length: 168
Shannon entropy: average 4.20 bits per byte
Information content: 88.24 bits

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.

Web Cookies Scanner

Cookie: `__cfduid`

Cookie origin and purpose

Cookie classification

Sample values

Domains targeted by `__cfduid` cookie

Websites setting `__cfduid` cookie

Web Cookies Scanner

Cookie: __cfduid

Cookie origin and purpose

Cookie classification

Sample values

Domains targeted by __cfduid cookie

Websites setting __cfduid cookie

Cookie: `__cfduid`

Domains targeted by `__cfduid` cookie

Websites setting `__cfduid` cookie