What is the _yasc cookie?
Collects data on the user across websites - This data is used to make advertisement more relevant.
Our October 2026 scan found it on 52 sites (2% of the 2,450 we scanned), set before any consent.
- Purpose
- Analytics
- Belongs to
- Yandex.Metrica
- Set as
- First-party on 13% of sites, third-party on 87%
- Typical lifetime
- 13 months (vendor says: 10 Years) — shorter than the vendor documents
- Where it's common
- 67% of the sites that set it use a .ru domain.
Sites that set _yasc before consent
The highest-ranked 30 of 52 sites.
- dzen.ru3 tracking companies
- mts.ru3 tracking companies
- ok.ru6 tracking companies
- yandex.com0 tracking companies
- ivi.ru10 tracking companies
- cdnvideo.ru2 tracking companies
- ya.ru1 tracking company
- globalsign.com3 tracking companies
- livejournal.com11 tracking companies
- pikabu.ru6 tracking companies
Show 20 more sites
- tbank.ru4 tracking companies
- aparat.com3 tracking companies
- megafon.ru5 tracking companies
- gismeteo.ru14 tracking companies
- rutube.ru1 tracking company
- litnet.com9 tracking companies
- playhop.com6 tracking companies
- rambler.ru9 tracking companies
- moe.video3 tracking companies
- 33apk.com1 tracking company
- sprinthost.ru5 tracking companies
- hh.ru5 tracking companies
- mirtesen.ru4 tracking companies
- ucoz.ru3 tracking companies
- kinopoisk.ru2 tracking companies
- ria.ru4 tracking companies
- drweb.com3 tracking companies
- smi2.net1 tracking company
- 2gis.ru5 tracking companies
- yandex.com.tr0 tracking companies
Related cookies
Other cookies from Yandex.Metrica.
How to stop it
Declining non-essential cookies in a site's consent banner should stop _yasc 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.