What is the _yjsu_yjad cookie?
We don't have a vendor description for this cookie yet, but our scan shows it's set under the sites' own domains rather than by a third party, and it typically lasts 12 months. It's listed as unclassified.
Our October 2026 scan found it on 24 sites (1% of the 2,450 we scanned), set before any consent.
- Purpose
- Unclassified
- Set as
- First-party (under the site's own domain)
- Typical lifetime
- 12 months
- Where it's common
- 38% of the sites that set it use a .jp domain.
Sites that set _yjsu_yjad before consent
The highest-ranked 24 of 24 sites.
- tabelog.com6 tracking companies
- hotpepper.jp13 tracking companies
- dmm.co.jp5 tracking companies
- jalan.net27 tracking companies
- carsensor.net31 tracking companies
- gamewith.jp6 tracking companies
- kakuyomu.jp18 tracking companies
- rakuten-sec.co.jp5 tracking companies
- oddspark.com7 tracking companies
- mechacomic.jp13 tracking companies
Show 14 more sites
- piccoma.com25 tracking companies
- alphapolis.co.jp9 tracking companies
- jra.jp6 tracking companies
- ecnavi.jp7 tracking companies
- sakura.ne.jp7 tracking companies
- asahi.com41 tracking companies
- nicovideo.jp24 tracking companies
- value-domain.com8 tracking companies
- prtimes.jp8 tracking companies
- au.com9 tracking companies
- mainichi.jp30 tracking companies
- japantimes.co.jp32 tracking companies
- dmm.com6 tracking companies
- kakaku.com22 tracking companies
How to stop it
Declining non-essential cookies in a site's consent banner should stop _yjsu_yjad 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.
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.