What is the _rxuuid cookie?
Sets a unique ID for the visitor, with which external advertisers can target the visitor with relevant advertisements. This linking service is provided by third-party advertising hubs, facilitating real-time bidding for advertisers.
Our October 2026 scan found it on 13 sites (1% of the 2,450 we scanned), set before any consent.
- Purpose
- Advertising
- Belongs to
- 1rx.io
- Set as
- Third-party (under another company's domain)
- Typical lifetime
- 12 months (vendor says: 1 year) — about what the vendor documents
Sites that set _rxuuid before consent
The highest-ranked 13 of 13 sites.
- techcrunch.com38 tracking companies
- gismeteo.ru14 tracking companies
- 24h.com.vn20 tracking companies
- chordtela.com34 tracking companies
- hindustantimes.com36 tracking companies
- idnes.cz42 tracking companies
- ctvnews.ca38 tracking companies
- myanimelist.net20 tracking companies
- dictionary.com35 tracking companies
- ynet.co.il23 tracking companies
Show 3 more sites
- detik.com13 tracking companies
- ana.co.jp16 tracking companies
- rediff.com42 tracking companies
How to stop it
Declining non-essential cookies in a site's consent banner should stop _rxuuid 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.