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.

charter.net app-ads.txt check

charter.net is missing out on higher CPMs: its app-ads.txt has 3 invalid lines. Buyers' crawlers skip invalid lines, so those sellers can't be verified.

Checked 21 Oct 2026. 43 lines, 25 unique records, 0 duplicates, 3 invalid lines, 3 ad networks detected.

Ad networks in charter.net/app-ads.txt

Index Exchange — account 207349: 1 line in the file
Google AdMob — account pub-2572892207479913: 1 line in the file
PubMatic — account 165900: 1 line in the file

Invalid lines

Dentsu
PMG
Ampersand

Corrected file: charter.net app-ads.txt (fixed).

FAQ

Does charter.net have an app-ads.txt?

Yes — https://charter.net/app-ads.txt has 43 lines (checked 21 Oct 2026).

Which ad networks does charter.net work with?

Its app-ads.txt lists Index Exchange, Google AdMob, PubMatic.

Is the app-ads.txt of charter.net correct?