ID5

A leading independent identity infrastructure provider in the post-cookie digital advertising ecosystem, offering a widely adopted universal ID solution used by publishers, advertisers, and ad tech platforms globally.

ID5 is an adaptive identity technology company that connects fragmented signals across environments to make digital advertising addressable and measurable across channels.^1,2 Its omnichannel identity infrastructure is designed to serve the entire ecosystem, fostering collaboration among advertisers, publishers, and technology partners.¹ Its flagship product, the ID5 ID, is a universal identifier that enables publishers, advertisers, and ad tech platforms to recognize users and deliver targeted, measurable campaigns across devices without relying on third-party cookies or mobile advertising IDs.³ ID5 also offers a cross-device graph that allows marketers to deploy people-based marketing strategies by connecting different signals to the same individual or household across devices.³ The ID5 ID is built with data protection in mind, leveraging consent signals and an encryption mechanism to ensure that users' privacy preferences are respected and enforced across the advertising value chain.³ There are no stated minimum traffic requirements to work with ID5, and integration is free.⁴ Source 1: id5.io — Holding Identity to Higher Standards - ID5.io Source 2: id5.io — Adaptive Identity for Omnichannel Advertising - ID5 Source 3: iabuk.com — ID5 ID and Cross-Device Graph Source 4: playwire.com — Ad Tech Ecosystem: ID5