What is the mp_* cookie?
This cookie is used to store a user's unique identifier.
Our October 2026 scan found it on 11 sites (0% of the 2,450 we scanned), set before any consent.
- Purpose
- Analytics
- Belongs to
- Mixpanel
- Set as
- First-party (under the site's own domain)
- Typical lifetime
- 12 months (vendor says: 1 year) — about what the vendor documents
- Name
- A family of cookies: the part after mp_ varies by site or account.
Sites that set mp_* before consent
The highest-ranked 11 of 11 sites.
- viber.com3 tracking companies
- fiverr.com7 tracking companies
- flightradar24.com4 tracking companies
- weforum.org3 tracking companies
- ubereats.com1 tracking company
- honor.com2 tracking companies
- asos.com5 tracking companies
- feedly.com5 tracking companies
- feverup.com5 tracking companies
- expressvpn.com2 tracking companies
Show 1 more site
- x.ai3 tracking companies
How to stop it
Declining non-essential cookies in a site's consent banner should stop mp_* being set on later visits. Blocking third-party cookies in your browser settings stops the third-party kind everywhere, and clearing cookies for a site removes any it already set.
Description from the Open Cookie Database (Apache 2.0).
Understanding this page
- How cookie lifetimes work, and why a 13-month _ga matters
What a cookie's "expires" field actually controls, why Google Analytics ships a 2-year default that many sites cut down to 13 months, and how Safari's 7-day cap on script-set cookies changes the picture.
- First-party vs third-party cookies (and why "first-party" still tracks you)
What the distinction actually means technically, why browsers only block one of the two, and how CNAME cloaking, server-side tagging and cookies like _ga let sites keep tracking under their own domain.
- How to block or limit trackers
Browser privacy settings, content blockers, Global Privacy Control and clearing cookies compared honestly — what each one actually stops, what it doesn't, and what it costs you in return.