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.

hbomax.com app-ads.txt check

hbomax.com 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 19 Oct 2026. 611 lines, 309 unique records, 43 duplicates, 3 invalid lines, 14 ad networks detected.

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

Amazon Publisher Services — accounts 1a2b659e-6776-4859-894b-2d60503ec681, 18be2365-efd9-4aaf-a367-eeb32a32b357, 3263a7fd-b9d3-4381-94e9-c8143529a788: 3 lines in the file
Google AdMob — accounts pub-7439281311086140, pub-5918277469327214, pub-1108628623474346 and 4 more: 7 lines in the file
Index Exchange — accounts 202522, 193280, 196430 and 2 more: 5 lines in the file
OpenX — accounts 558598331, 557890910, 559546846: 3 lines in the file
PubMatic — accounts 162078, 163542, 161390 and 5 more: 8 lines in the file
Yahoo — accounts 59137, 59477: 2 lines in the file
Smaato — account 1100047232: 1 line in the file
Xandr (Microsoft) — accounts 13510, 1705, 12272: 3 lines in the file
TripleLift — accounts 13806, 11243: 2 lines in the file
Criteo — account B-068556: 1 line in the file
Mintegral — partner (reseller) lines only: 11 lines in the file, 400 expected lines missing
Yango Ads — partner (reseller) lines only: 19 lines in the file, 400 expected lines missing
DSP Exchange — partner (reseller) lines only: 22 lines in the file, 400 expected lines missing
Bidmachine — partner (reseller) lines only: 16 lines in the file, 400 expected lines missing

Invalid lines

freewheel 386345-524565 DIRECT
Dentsu.com,73352, INTERMEDIARY
appnexus.com, DIRECT, 12272

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

FAQ

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

Yes — https://hbomax.com/app-ads.txt has 611 lines (checked 19 Oct 2026).

Which ad networks does hbomax.com work with?

Its app-ads.txt lists Amazon Publisher Services, Google AdMob, Index Exchange, OpenX, PubMatic, Yahoo, Smaato, Xandr (Microsoft), TripleLift, Criteo, Mintegral, Yango Ads and 2 more.

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