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.

pekingtec.com achieves the best ad optimization: its app-ads.txt has no errors and matches what its ad network expects (100% of 1 line).

Checked 20 Oct 2026. 64 lines, 64 unique records, 0 duplicates, 0 invalid lines, 9 ad networks detected.

Google AdMob — account pub-3032050490101276: 1 line in the file
Mintegral — partner (reseller) lines only: 31 lines in the file, 400 expected lines missing
InMobi — partner (reseller) lines only: 27 lines in the file, 244 expected lines missing
DT Exchange (Fyber) — partner (reseller) lines only: 14 lines in the file, 400 expected lines missing
BIGO Ads — partner (reseller) lines only: 19 lines in the file, 400 expected lines missing
Yango Ads — partner (reseller) lines only: 39 lines in the file, 400 expected lines missing
Maticoo (zMaticoo) — partner (reseller) lines only: 14 lines in the file, 400 expected lines missing
Verve (PubNative) — partner (reseller) lines only: 21 lines in the file, 400 expected lines missing
Bidmachine — partner (reseller) lines only: 39 lines in the file, 400 expected lines missing

Yes — https://pekingtec.com/app-ads.txt has 64 lines (checked 20 Oct 2026).

Its app-ads.txt lists Google AdMob, Mintegral, InMobi, DT Exchange (Fyber), BIGO Ads, Yango Ads, Maticoo (zMaticoo), Verve (PubNative), Bidmachine.

pekingtec.com achieves the best ad optimization: its app-ads.txt has no errors and matches what its ad network expects (100% of 1 line).