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.

prepear.com app-ads.txt check

prepear.com achieves the best ad optimization: its app-ads.txt has no errors and matches what its 10 ad networks expect (100% of 43 lines).

Checked 19 Oct 2026. 218 lines, 106 unique records, 1 duplicates, 0 invalid lines, 10 ad networks detected.

Ad networks in prepear.com/app-ads.txt

Google AdMob — accounts pub-5102287125854146, pub-8501674430909082: 2 lines in the file
Sovrn — accounts 214800, 247572: 2 lines in the file
Index Exchange — accounts 182496, 189263, 184914 and 2 more: 5 lines in the file
OpenX — accounts 537143229, 539404983, 540814319: 3 lines in the file
Xandr (Microsoft) — account 3561: 1 line in the file
TripleLift — accounts 4800, 4801, 4802 and 15 more: 18 lines in the file
Amazon Publisher Services — account 4fbba76f-7987-4fa2-9733-c27eb3a2170b: 1 line in the file
Magnite (Rubicon) — accounts 17698, 9262, 21552 and 2 more: 5 lines in the file
PubMatic — accounts 157333, 157347, 157852 and 3 more: 6 lines in the file
Yahoo — account 72409f4d-9858-41ac-bf45-be255b82de89: 1 line in the file

Corrected file: prepear.com app-ads.txt (fixed).

FAQ

Does prepear.com have an app-ads.txt?

Yes — https://prepear.com/app-ads.txt has 218 lines (checked 19 Oct 2026).

Which ad networks does prepear.com work with?

Its app-ads.txt lists Google AdMob, Sovrn, Index Exchange, OpenX, Xandr (Microsoft), TripleLift, Amazon Publisher Services, Magnite (Rubicon), PubMatic, Yahoo.

Is the app-ads.txt of prepear.com correct?