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.

radiofrance.com achieves the best ad optimization: its app-ads.txt has no errors and matches what its 6 ad networks expect (100% of 7 lines).

Checked 20 Oct 2026. 69 lines, 61 unique records, 1 duplicates, 0 invalid lines, 8 ad networks detected.

Google AdMob — account pub-7759753907778440: 1 line in the file
Magnite (Rubicon) — accounts 19746, 13788: 2 lines in the file
Xandr (Microsoft) — account 3051: 1 line in the file
Amazon Publisher Services — account 47b3bdce-3a0c-491e-b9d2-91d4e72a5385: 1 line in the file
Criteo — account B-058098: 1 line in the file
TripleLift — account 10452: 1 line in the file
Mintegral — partner (reseller) lines only: 15 lines in the file, 400 expected lines missing
Yango Ads — partner (reseller) lines only: 15 lines in the file, 400 expected lines missing

Yes — https://radiofrance.com/app-ads.txt has 69 lines (checked 20 Oct 2026).

Its app-ads.txt lists Google AdMob, Magnite (Rubicon), Xandr (Microsoft), Amazon Publisher Services, Criteo, TripleLift, Mintegral, Yango Ads.

radiofrance.com achieves the best ad optimization: its app-ads.txt has no errors and matches what its 6 ad networks expect (100% of 7 lines).