What is the _dc_gtm_* cookie?
Used to monitor number of Google Analytics server requests.
Our October 2026 scan found it on 23 sites (1% of the 2,450 we scanned), set before any consent.
- Purpose
- Analytics
- Belongs to
- Google Analytics
- Set as
- First-party (under the site's own domain)
- Typical lifetime
- Under a day (vendor says: 1 minute)
- Name
- A family of cookies: the part after _dc_gtm_ varies by site or account.
Sites that set _dc_gtm_* before consent
The highest-ranked 23 of 23 sites.
- ok.ru6 tracking companies
- liftoff.io6 tracking companies
- spamhaus.org3 tracking companies
- vnexpress.net14 tracking companies
- mundodeportivo.com13 tracking companies
- netkeiba.com20 tracking companies
- jino.ru3 tracking companies
- jalan.net27 tracking companies
- kakuyomu.jp18 tracking companies
- buzzfeed.com16 tracking companies
Show 13 more sites
- xoso.com.vn2 tracking companies
- auone.jp10 tracking companies
- hatena.ne.jp19 tracking companies
- undp.org5 tracking companies
- unep.org10 tracking companies
- tokopedia.com8 tracking companies
- ynet.co.il23 tracking companies
- hepsiburada.com6 tracking companies
- pushwoosh.com5 tracking companies
- teacherspayteachers.com5 tracking companies
- fastpanel.direct4 tracking companies
- bankrate.com9 tracking companies
- nifty.com32 tracking companies
Related cookies
Other cookies from Google Analytics.
- _ga700 sites
- _ga_*685 sites
- _gid185 sites
- _gat*108 sites
- _gat_gtag_*55 sites
How to stop it
Declining non-essential cookies in a site's consent banner should stop _dc_gtm_* 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.