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.

lanacion.com.ar achieves the best ad optimization: its app-ads.txt has no errors and matches what its 7 ad networks expect (100% of 11 lines).

Checked 21 Oct 2026. 33 lines, 23 unique records, 0 duplicates, 0 invalid lines, 7 ad networks detected.

Google AdMob — accounts pub-9725657087458329, pub-7767162874553201: 2 lines in the file
TripleLift — accounts 7297, 7297-EB: 2 lines in the file
OpenX — account 540717796: 1 line in the file
Sovrn — account 267587: 1 line in the file
Magnite (Rubicon) — accounts 20148, 20150: 2 lines in the file
Index Exchange — accounts 189732, 189749: 2 lines in the file
PubMatic — accounts 157821, 158059: 2 lines in the file

Yes — https://lanacion.com.ar/app-ads.txt has 33 lines (checked 21 Oct 2026).

Its app-ads.txt lists Google AdMob, TripleLift, OpenX, Sovrn, Magnite (Rubicon), Index Exchange, PubMatic.

lanacion.com.ar achieves the best ad optimization: its app-ads.txt has no errors and matches what its 7 ad networks expect (100% of 11 lines).