Publisher.domain

The seller's highest-level domain, such as citymedia.example, without subdomains, scheme, or path.

CurrentstringOptionalSince 2.0

Field facts

Path: app.publisher.domain, dooh.publisher.domain, site.publisher.domain
Object: Publisher
Type: string
Requirement: Optional
Added: OpenRTB 2.0
Spec section: 3.2.15

How it is used

For a publisher selling its own site, it is usually the company domain behind Site.domain. When an intermediary is the paid seller, it is the intermediary's domain, which is why it can differ from the site or app being sold. Before 2.6 the spec described it as the publisher's domain.

Example

Where the field sits in a payload, with everything else left out:

{
  "id": "req-1",
  "app": {
    "publisher": {
      "domain": "citymedia.example"
    }
  }
}

Common mistakes

Copying Site.domain with its subdomain, such as news.citymedia.example, when the field asks for the seller's highest-level domain.

Version history

Added in OpenRTB 2.0, and present in the latest snapshot. The table shows how each version's spec text types the field.

Versions	Type in the spec	Required	Deprecated
2.0 to 2.2	string	No	No
2.3 to 2.3.1	string	No	No
2.4	string	No	No
2.5 to 2.6-202606	string	No	No