Content.cattax

Names the taxonomy used by Content.cat, from the AdCOM Category Taxonomies list. Defaults to 1, IAB Content Category Taxonomy 1.0. Added in OpenRTB 2.6.

CurrentintegerOptionalSince 2.6-202204

Field facts

Path: app.content.cattax, dooh.content.cattax, site.content.cattax
Object: Content
Type: integer
Default: 1
Requirement: Optional
Added: OpenRTB 2.6-202204
Values: AdCOM list Category Taxonomies
Spec section: 3.2.16

Allowed values

Value	Meaning
`1`	IAB Tech Lab Content Category Taxonomy 1.0: The original IAB content categories with codes like IAB1-1; deprecated, but still the default when `cattax` is omitted.
`2`	IAB Tech Lab Content Category Taxonomy 2.0: Content Taxonomy 2.0, the first version with numeric IDs; deprecated in favor of later releases.
`3`	IAB Tech Lab Ad Product Taxonomy 1.0: Categories for the product or service an ad promotes, used for ad blocking and creative labeling.
`4`	IAB Tech Lab Audience Taxonomy 1.1: Audience Taxonomy 1.1, which describes people (demographics, interests, purchase intent) rather than content or ads.
`5`	IAB Tech Lab Content Taxonomy 2.1: Content Taxonomy 2.1, a 2.x revision suitable for content classification.
`6`	IAB Tech Lab Content Taxonomy 2.2: Content Taxonomy 2.2, the newest 2.x version in this list.
`7`	IAB Tech Lab Content Taxonomy 3.0: Content Taxonomy 3.0, the first release of the 3.x generation.
`8`	IAB Tech Lab Ad Product Taxonomy 2.0: Ad Product Taxonomy 2.0, the newer of the two ad product versions in this list.
`9`	IAB Tech Lab Content Taxonomy 3.1: Content Taxonomy 3.1, also the default taxonomy for `Content.genres` when `Content.gtax` is absent.
`500+`	Vendor-specific codes: Vendor-specific taxonomies, such as an exchange's own category codes, agreed between the parties.

Example

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

{
  "id": "req-1",
  "app": {
    "content": {
      "cattax": 7
    }
  }
}

Common mistakes

Assuming cattax also covers Content.genres. Genres use Content.gtax, which defaults to 9 rather than 1.

Version history

Added in OpenRTB 2.6-202204, 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
2.6-202204	Added in the first 2.6 release, published without a structured text archive; the 2.6-202210 republication is the first tagged text.
2.6-202210 to 2.6-202606	integer, default 1	No	No