Category taxonomies value 9 means IAB Tech Lab Content Taxonomy 3.1

When to send it

Value 9 selects Content Taxonomy 3.1. It is valid in every content-side cattax field, and it has a second role: Content.gtax, which names the taxonomy for Content.genres, defaults to 9. When gtax is absent, genre IDs are read against the subset of 3.1 rows in the IAB CTV genre mapping.

Buyers targeting CTV genres use 9 to resolve Content.genres into a known list. The value is confused with 7 (Content Taxonomy 3.0) and, more often, sellers forget that Content.cattax and Content.gtax are separate: setting gtax to 9 does not change the taxonomy of Content.cat, which still defaults to 1.

Example

{
  "app": {
    "cattax": 9
  }
}

Fields that carry it

• app.cattax
• seatbid.bid.cattax
• cattax
• app.content.cattax
• app.content.gtax
• app.content.producer.cattax
• app.publisher.cattax
• site.cattax

Other values in category taxonomies

The category taxonomies list page explains the whole list and its common mistakes.