What is the id5 cookie?
Sets a unique ID for the visitor, that allows third party advertisers to target the visitor with relevant advertisement. This pairing service is provided by third party advertisement hubs, which facilitates real-time bidding for advertisers.
Our October 2026 scan found it on 26 sites (1% of the 2,450 we scanned), set before any consent.
- Purpose
- Advertising
- Belongs to
- ID5
- Set as
- Third-party (under another company's domain)
- Typical lifetime
- 3 months (vendor says: 1 day) — longer than the vendor documents
Sites that set id5 before consent
The highest-ranked 26 of 26 sites.
- indiatimes.com18 tracking companies
- netkeiba.com20 tracking companies
- weathernews.jp7 tracking companies
- oricon.co.jp36 tracking companies
- syosetu.com24 tracking companies
- carsensor.net31 tracking companies
- goodreturns.in25 tracking companies
- buzzfeed.com16 tracking companies
- mamastar.jp5 tracking companies
- mechacomic.jp13 tracking companies
Show 16 more sites
- piccoma.com25 tracking companies
- animanch.com22 tracking companies
- ojogodobicho.com6 tracking companies
- loteriasdominicanas.com14 tracking companies
- gamespot.com8 tracking companies
- hindustantimes.com36 tracking companies
- aarp.org30 tracking companies
- asahi.com41 tracking companies
- myanimelist.net20 tracking companies
- thedailybeast.com18 tracking companies
- bostonglobe.com10 tracking companies
- conectate.com.do10 tracking companies
- rediff.com42 tracking companies
- searchenginejournal.com8 tracking companies
- infoseek.co.jp22 tracking companies
- homes.com17 tracking companies
Related cookies
Other cookies from ID5.
- gdpr5 sites
How to stop it
Declining non-essential cookies in a site's consent banner should stop id5 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.