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CookieTosser

ID5

Advertising

ID5 loaded on 67 sites in our October 2026 scan: 3% of the 2,450 most-visited sites we checked, before any visitor had given consent.

Category: Advertising. A company can do several jobs; this is its main role on the pages we saw.

Its cookies typically last about 3 months. On 78% of the sites where it loaded, a consent banner was already present but hadn't been answered yet. It's especially common on .jp sites: 24% of them load it, versus 3% of all sites we scanned.

About ID5

ID5 provides a shared advertising identifier, built to give advertisers and publishers a consistent way to recognize a visitor as third-party cookies become less available.

Its script from id5-sync.com generates or retrieves an ID5 ID and makes it available to other ad-tech companies on the page, typically storing it in a cookie such as id5, so those companies can match the same visitor without each setting their own separate identifier.

Often loaded alongside

Sites that load ID5 most often also load Google Ads (96%), Google (84%), Google Analytics (84%), Amazon Advertising (76%), and jsDelivr (48%).

Domains it loads from

  • cdn.id5-sync.com
  • id5-sync.com
  • lb.eu-1-id5-sync.com
  • api.id5-sync.com
  • d0.eu-3-id5-sync.com
  • d1.eu-3-id5-sync.com
  • d2.eu-3-id5-sync.com
  • d3.eu-3-id5-sync.com
  • d4.eu-3-id5-sync.com
  • d5.eu-3-id5-sync.com
  • d6.eu-3-id5-sync.com
  • d7.eu-3-id5-sync.com
  • d0.eu-4-id5-sync.com
  • d1.eu-4-id5-sync.com
  • d2.eu-4-id5-sync.com
  • d3.eu-4-id5-sync.com
  • d4.eu-4-id5-sync.com
  • d5.eu-4-id5-sync.com
  • d6.eu-4-id5-sync.com
  • d7.eu-4-id5-sync.com
  • lbs.eu-1-id5-sync.com

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Sites that load ID5

The highest-ranked 30 of 67 sites.

Show 20 more sites

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