What is Sovrn's CMP ID?

Sovrn's IAB TCF Consent Management Platform ID is 11, registered as Sovrn Holdings Inc.

For background on what a CMP is and why it matters, see What is a Consent Management Platform (CMP)?

Where can I verify Sovrn's CMP ID?

There are two official sources, both maintained by IAB Europe.

The IAB CMP List (JSON) is the canonical machine-readable list at cmplist.consensu.org/v2/cmp-list.json. Open the URL in your browser or run a curl request and search for "Sovrn" — you'll see the entry with "id": 11.

The IAB Europe CMP Registry at iabeurope.eu/cmp-list/ loads the same data in a searchable web UI. Search for "Sovrn" and the ID column will show 11.

Why does the CMP ID matter when auditing bid requests?

When you decode a TC String, the cmpId field tells you which CMP collected the user's consent. If consent was collected by Sovrn's own CMP, you'll see cmpId: 11.

A different cmpId on traffic routed through Sovrn means the publisher is using a third-party CMP — OneTrust, Sourcepoint, Quantcast, or another vendor. This is normal and expected. When troubleshooting consent signal issues on that traffic, the third-party CMP is the source of truth for how the TC String was constructed, so that vendor is the right starting point for debugging.

For details on which TCF version Sovrn supports, see What versions of TCF do you support?

Questions? Concerns? Our team would be more than happy to help. Reach out to our Support Team here.