PREF HTTP cookie

This cookie name is being set on 64,764 websites and 322 distinct domains and we have seen it bein used in the following objects:

64,764 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.

YouTube cookie (confidence 0.75)
» Reference...

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Cookie classification

unknown (confidence 1)

Sample values

Sample value:

f1=50000000

Length: 11 bytes (88 bits)
Information entropy: 1.67 bits (average bits per symbol)
Information content: 18.40 bits

Sample value:

f1=50000000&f5=30

This might be a Base64-encoded cookie. Decoded value:

b'\x7f\x9d\xf4'

Length: 3 bytes (24 bits)
Information entropy: 1.58 bits (average bits per symbol)
Information content: 4.75 bits

Sample value:

f5=30

This might be a Base64-encoded cookie. Decoded value:

b'\x7f\x9d\xf4'

Length: 3 bytes (24 bits)
Information entropy: 1.58 bits (average bits per symbol)
Information content: 4.75 bits

Domains targeted by `PREF` 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: `PREF`

Cookie origin and purpose

Cookie classification

Sample values

Domains targeted by `PREF` cookie

Websites setting `PREF` cookie

Web Cookies Scanner

Cookie: PREF

Cookie origin and purpose

Cookie classification

Sample values

Domains targeted by PREF cookie

Websites setting PREF cookie

Cookie: `PREF`

Domains targeted by `PREF` cookie

Websites setting `PREF` cookie