What is the opt_out cookie?
This cookie is used to remember not to serve that user targeted Ads if they opt out.
Our October 2026 scan found it on 20 sites (1% of the 2,450 we scanned), set before any consent.
- Purpose
- Advertising
- Belongs to
- Nativo
- Set as
- First-party on 40% of sites, third-party on 60%
- Typical lifetime
- 12 months (vendor says: 1 year) — about what the vendor documents
Sites that set opt_out before consent
The highest-ranked 20 of 20 sites.
- amazon.com33 tracking companies
- speedtest.net5 tracking companies
- amazon.co.za32 tracking companies
- techcrunch.com38 tracking companies
- cnet.com6 tracking companies
- apnews.com14 tracking companies
- amazon.com.mx34 tracking companies
- fortune.com7 tracking companies
- zdnet.com8 tracking companies
- mashable.com7 tracking companies
Show 10 more sites
- pcmag.com5 tracking companies
- moz.com11 tracking companies
- amazon.ae32 tracking companies
- foodnetwork.com3 tracking companies
- lifehacker.com7 tracking companies
- iu.edu15 tracking companies
- rfa.org4 tracking companies
- popsci.com7 tracking companies
- amazon.sa32 tracking companies
- washingtontimes.com21 tracking companies
Related cookies
Other cookies from Nativo.
- A33 sites
How to stop it
Declining non-essential cookies in a site's consent banner should stop opt_out 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.