What is the cid cookie?
Unique value to be able to identify cookies from users (same as uid).
Our October 2026 scan found it on 24 sites (1% of the 2,450 we scanned), set before any consent.
- Purpose
- Advertising
- Belongs to
- Adform
- Set as
- First-party on 13% of sites, third-party on 88%
- Typical lifetime
- 13 months (vendor says: 60 days) — longer than the vendor documents
- Where it's common
- 79% of the sites that set it use a .ru domain.
Sites that set cid before consent
The highest-ranked 24 of 24 sites.
- mts.ru3 tracking companies
- ivi.ru10 tracking companies
- rakuten.com3 tracking companies
- livejournal.com11 tracking companies
- tbank.ru4 tracking companies
- megafon.ru5 tracking companies
- apa.org4 tracking companies
- rutube.ru1 tracking company
- rambler.ru9 tracking companies
- moe.video3 tracking companies
Show 14 more sites
- vtb.ru4 tracking companies
- mirtesen.ru4 tracking companies
- magnit.ru6 tracking companies
- sberdevices.ru7 tracking companies
- narod.ru5 tracking companies
- lenta.ru9 tracking companies
- askona.ru8 tracking companies
- sber.ru6 tracking companies
- insales.ru9 tracking companies
- liveinternet.ru7 tracking companies
- bspb.ru2 tracking companies
- gazprombank.ru4 tracking companies
- kinoafisha.info5 tracking companies
- iz.ru8 tracking companies
Related cookies
Other cookies from Adform.
- uid99 sites
How to stop it
Declining non-essential cookies in a site's consent banner should stop cid 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.