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.

luckystarsstudio.tech 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. 91 lines, 90 unique records, 1 duplicates, 0 invalid lines, 10 ad networks detected.

Google AdMob — accounts pub-4899186700083541, pub-3940256099942544: 2 lines in the file
Smaato — account 1100048469: 1 line in the file
PubMatic — account 159856: 1 line in the file
OpenX — account 544029643: 1 line in the file
Mintegral — partner (reseller) lines only: 32 lines in the file, 400 expected lines missing
Chartboost — partner (reseller) lines only: 29 lines in the file, 400 expected lines missing
DT Exchange (Fyber) — partner (reseller) lines only: 11 lines in the file, 400 expected lines missing
Yango Ads — partner (reseller) lines only: 48 lines in the file, 400 expected lines missing
DSP Exchange — partner (reseller) lines only: 15 lines in the file, 400 expected lines missing
Bidmachine — partner (reseller) lines only: 23 lines in the file, 400 expected lines missing

Yes — https://luckystarsstudio.tech/app-ads.txt has 91 lines (checked 20 Oct 2026).

Its app-ads.txt lists Google AdMob, Smaato, PubMatic, OpenX, Mintegral, Chartboost, DT Exchange (Fyber), Yango Ads, DSP Exchange, Bidmachine.

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