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.

hosting-admob.firebaseapp.com app-ads.txt check

hosting-admob.firebaseapp.com achieves the best ad optimization: its app-ads.txt has no errors and matches what its 2 ad networks expect (100% of 2 lines).

Checked 20 Oct 2026. 2 lines, 2 unique records, 0 duplicates, 0 invalid lines, 2 ad networks detected.

Ad networks in hosting-admob.firebaseapp.com/app-ads.txt

Google AdMob — account pub-2390156911557598: 1 line in the file
Meta Audience Network — account 3881026582017800: 1 line in the file

Corrected file: hosting-admob.firebaseapp.com app-ads.txt (fixed).

FAQ

Does hosting-admob.firebaseapp.com have an app-ads.txt?

Yes — https://hosting-admob.firebaseapp.com/app-ads.txt has 2 lines (checked 20 Oct 2026).

Which ad networks does hosting-admob.firebaseapp.com work with?

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

Is the app-ads.txt of hosting-admob.firebaseapp.com correct?