What is the SERVERID cookie?
Load balancer cookie.
Our October 2026 scan found it on 21 sites (1% of the 2,450 we scanned), set before any consent.
- Purpose
- Functional
- Belongs to
- HAproxy
- Set as
- First-party on 52% of sites, third-party on 48%
- Typical lifetime
- Under a day (vendor says: session)
Sites that set SERVERID before consent
The highest-ranked 21 of 21 sites.
- usps.com24 tracking companies
- tapad.com12 tracking companies
- theblowers.com0 tracking companies
- acm.org4 tracking companies
- va.gov2 tracking companies
- euronews.com12 tracking companies
- bollyflix.free7 tracking companies
- hdhub4u.bi8 tracking companies
- unicef.org13 tracking companies
- house.gov1 tracking company
Show 11 more sites
- purdue.edu19 tracking companies
- www.gov.cn0 tracking companies
- cnil.fr0 tracking companies
- nsw.gov.au7 tracking companies
- rutgers.edu12 tracking companies
- vkusvill.ru0 tracking companies
- pchome.com.tw6 tracking companies
- findlaw.com11 tracking companies
- cnblogs.com1 tracking company
- 3ds.com3 tracking companies
- rj.link0 tracking companies
How to stop it
Declining non-essential cookies in a site's consent banner should stop SERVERID 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.