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.

hamivideo.hinet.net 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. 106 lines, 81 unique records, 2 duplicates, 0 invalid lines, 6 ad networks detected.

Google AdMob — accounts pub-5975099769234610, pub-7536233758046663, pub-1740840196959600 and 19 more: 22 lines in the file
Xandr (Microsoft) — account 11592: 1 line in the file
Index Exchange — account 200190: 1 line in the file
Magnite (Rubicon) — account 22884: 1 line in the file
Smaato — accounts 1100052702, 1100004890: 2 lines in the file
Criteo — account B-060310: 1 line in the file

Yes — https://hamivideo.hinet.net/app-ads.txt has 106 lines (checked 20 Oct 2026).

Its app-ads.txt lists Google AdMob, Xandr (Microsoft), Index Exchange, Magnite (Rubicon), Smaato, Criteo.

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