Bid.adomain

The advertiser's domain, used to check the bid against the publisher's advertiser block list. Several entries are allowed for rotating creatives, though an exchange may insist on exactly one.

Currentstring arrayOptionalSince 2.0

Field facts

Path: seatbid.bid.adomain
Object: Bid
Type: string array
Requirement: Optional
Added: OpenRTB 2.0
Spec section: 4.2.3

How it is used

Send the advertiser's bare domain, the one a user would land on, not an ad server or tracking domain. Exchanges compare it with BidRequest.badv, so a bid without it cannot be checked.

Example

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

{
  "seatbid": [
    {
      "bid": [
        {
          "adomain": [
            "brand.example"
          ]
        }
      ]
    }
  ]
}

Common mistakes

Sending a click tracker or DSP domain instead of the advertiser's own domain.
A full URL such as https://www.brand.example/offer instead of brand.example.

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 2.1	Array of string	No	No
2.2	array of strings	No	No
2.3 to 2.4	string array	No	No
2.5	array	No	No
2.6-202210 to 2.6-202606	string array	No	No

Related fields

Other Bid fields

For a walkthrough of the whole object, read Bid response anatomy.