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See how many identifiers are in an audience segment

This article is specific to DFP Audience.
This feature might not be enabled in your DFP environment. For more details, contact your manager or a DoubleClick representative.

You can see how many identifiers (cookies, mobile advertising IDs (AdID or IDFA), or PPIDs) are in a particular segment on the "Audience segments" screen.

To go to the "Audience segments" screen, click the Inventory tab and click Audience segments in the left navigation pane.

For first-party segments, the "Total size" column displays how many identifiers are in the segment and is updated multiple times per day.

For third-party segments, the "Total size" column shows how many identifiers are provided in the segment but doesn't necessarily reflect the total amount of unique impressions you'll get from the segment. This could be because some identifiers are stale or based in another country.

  • Total size is determined by sampling and is not an exact number. It is updated approximately every 30 minutes.  For this reason, the size shown in the user interface might not exactly match the number of identifiers uploaded. 
  • Also note that for smaller segments, the threshold to show ads might be as high as 150 users because our systems use statistical modeling to estimate the number of active users associated with a segment. The smaller the list, the higher the variance in our estimates; we therefore need to accumulate more data before meeting the desired statistical threshold.
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