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.

discoveryplus.com app-ads.txt check

discoveryplus.com is missing out on higher CPMs: its app-ads.txt has 1 invalid line. Buyers' crawlers skip invalid lines, so those sellers can't be verified.

Checked 20 Oct 2026. 675 lines, 362 unique records, 84 duplicates, 1 invalid lines, 9 ad networks detected.

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

Amazon Publisher Services — accounts 0a0a09f3-0775-40c4-be89-c7fcc0b7b0af, 196ae52e-68da-41b3-82a8-6a2cd027d137, 41b73ba2-6643-43ff-9ec5-406609eab609: 3 lines in the file
Google AdMob — accounts pub-5477046158330132, pub-1447015946981655, pub-5470823642586784 and 8 more: 11 lines in the file
Index Exchange — accounts 208830, 211534, 202522: 3 lines in the file
PubMatic — accounts 163611, 164162, 156695 and 7 more: 10 lines in the file
Xandr (Microsoft) — account 12272: 1 line in the file
Yahoo — accounts 59494, 59477, 58969: 3 lines in the file
OpenX — accounts 558598331, 557890910: 2 lines in the file
BIGO Ads — partner (reseller) lines only: 10 lines in the file, 400 expected lines missing
Yango Ads — partner (reseller) lines only: 11 lines in the file, 400 expected lines missing

Invalid lines

freewheel, 393759, RESELLER

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

FAQ

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

Yes — https://discoveryplus.com/app-ads.txt has 675 lines (checked 20 Oct 2026).

Which ad networks does discoveryplus.com work with?

Its app-ads.txt lists Amazon Publisher Services, Google AdMob, Index Exchange, PubMatic, Xandr (Microsoft), Yahoo, OpenX, BIGO Ads, Yango Ads.

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