What is the ad-id cookie?
Clickthroughs to Amazon websites: Noting how the user got to Amazon via this website.
Our October 2026 scan found it on 24 sites (1% of the 2,450 we scanned), set before any consent.
- Purpose
- Advertising
- Belongs to
- Amazon
- Set as
- First-party on 4% of sites, third-party on 96%
- Typical lifetime
- 9 months (vendor says: 190 days) — longer than the vendor documents
Sites that set ad-id before consent
The highest-ranked 24 of 24 sites.
- amazon.com33 tracking companies
- amazon.co.za32 tracking companies
- usps.com24 tracking companies
- amazon.com.mx34 tracking companies
- mechacomic.jp13 tracking companies
- xfinity.com8 tracking companies
- verizon.com20 tracking companies
- ford.com17 tracking companies
- arizona.edu9 tracking companies
- audible.com25 tracking companies
Show 14 more sites
- aarp.org30 tracking companies
- simplisafe.com31 tracking companies
- amazon.ae32 tracking companies
- gm.com10 tracking companies
- xero.com18 tracking companies
- vanguard.com17 tracking companies
- citi.com9 tracking companies
- umass.edu13 tracking companies
- rediff.com42 tracking companies
- reolink.com11 tracking companies
- amazon.sa32 tracking companies
- eleconomista.es24 tracking companies
- homes.com17 tracking companies
- nhtsa.gov5 tracking companies
Related cookies
Other cookies from Amazon.
- ad-privacy13 sites
How to stop it
Declining non-essential cookies in a site's consent banner should stop ad-id 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.