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.

m.mobilelegends.com achieves the best ad optimization: its app-ads.txt has no errors and matches what its 4 ad networks expect (100% of 4 lines).

Checked 20 Oct 2026. 6 lines, 6 unique records, 0 duplicates, 0 invalid lines, 4 ad networks detected.

Google AdMob — accounts pub-5437072748643530, pub-5510584395087266: 2 lines in the file
Meta Audience Network — account 513601762717619: 1 line in the file
OpenX — account 545647040: 1 line in the file
PubMatic — account 159856: 1 line in the file

Yes — https://m.mobilelegends.com/app-ads.txt has 6 lines (checked 20 Oct 2026).

Its app-ads.txt lists Google AdMob, Meta Audience Network, OpenX, PubMatic.

m.mobilelegends.com achieves the best ad optimization: its app-ads.txt has no errors and matches what its 4 ad networks expect (100% of 4 lines).