What is the atuserid cookie?
Visitor ID for client-side cookie sites.
Our October 2026 scan found it on 4 sites (0% of the 2,450 we scanned), set before any consent.
- Purpose
- Analytics
- Belongs to
- AT Internet
- Set as
- First-party (under the site's own domain)
- Typical lifetime
- 13 months (vendor says: 13 months by default, modifiable) — about what the vendor documents
Sites that set atuserid before consent
The highest-ranked 4 of 4 sites.
- gandi.net1 tracking company
- ladepeche.fr3 tracking companies
- rte.ie1 tracking company
- bnf.fr1 tracking company
Related cookies
Other cookies from AT Internet.
- pa_privacy15 sites
- pa_vid3 sites
How to stop it
Declining non-essential cookies in a site's consent banner should stop atuserid 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.