An IAB Tech Lab standard that lets app publishers declare which ad networks are authorized to sell their inventory.

Where do I put the app-ads.txt file?

At the root of the developer website listed in your App Store / Google Play page, e.g. https://studio.com/app-ads.txt.

What is a Certification Authority ID?

An optional TAG-ID of the ad system, the 4th field of an app-ads.txt record.

usatoday.com app-ads.txt check

usatoday.com achieves the best ad optimization: its app-ads.txt has no errors and matches what its 12 ad networks expect (100% of 36 lines).

Checked 19 Oct 2026. 203 lines, 164 unique records, 2 duplicates, 0 invalid lines, 12 ad networks detected.

Ad networks in usatoday.com/app-ads.txt

Criteo — account B-062125: 1 line in the file
Xandr (Microsoft) — account 7155: 1 line in the file
Amazon Publisher Services — accounts ad73e3cd-c456-4104-aab1-56236f5d5135, f9d9c808-1374-43ba-8903-41b6673fa803: 2 lines in the file
Google AdMob — accounts pub-3469238942564955, pub-5717092533913515: 2 lines in the file
Index Exchange — accounts 184808, 185192, 200872: 3 lines in the file
Sovrn — accounts 293450, 293450-eb: 2 lines in the file
OpenX — accounts 539323871, 540060988: 2 lines in the file
Magnite (Rubicon) — accounts 10968, 11324, 17346 and 2 more: 5 lines in the file
Smaato — accounts 1100004890, 1100033996, 1100039440 and 1 more: 4 lines in the file
Yahoo — accounts 4941, 55377, 57893 and 1 more: 4 lines in the file
PubMatic — accounts 156719, 156719-D, 157904: 3 lines in the file
TripleLift — accounts 11200, 2793, 2862 and 5 more: 8 lines in the file

Corrected file: usatoday.com app-ads.txt (fixed).

FAQ

Does usatoday.com have an app-ads.txt?

Yes — https://usatoday.com/app-ads.txt has 203 lines (checked 19 Oct 2026).

Which ad networks does usatoday.com work with?

Its app-ads.txt lists Criteo, Xandr (Microsoft), Amazon Publisher Services, Google AdMob, Index Exchange, Sovrn, OpenX, Magnite (Rubicon), Smaato, Yahoo, PubMatic, TripleLift.

Is the app-ads.txt of usatoday.com correct?