Category taxonomies value 2 means IAB Tech Lab Content Category Taxonomy 2.0

When to send it

Value 2 points to Content Taxonomy 2.0, the first version to drop the IAB-prefixed codes in favor of numeric unique IDs and a deeper tier structure. Like 1, AdCOM deprecates it because it lacks sensitive-category flags, so it should not be chosen for a new integration. It is valid in any cattax field.

Later 2.x releases build on the same numeric ID scheme, which makes 2 easy to confuse with 5 (Content Taxonomy 2.1) and 6 (Content Taxonomy 2.2). A buyer cannot tell from the IDs alone which file a seller used. If your classifier output comes from a 2.1 or 2.2 file, send that value instead of 2.

Example

{
  "app": {
    "cattax": 2
  }
}

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.