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.

newyorker.com app-ads.txt check

newyorker.com achieves the best ad optimization: its app-ads.txt has no errors and matches what its 10 ad networks expect (100% of 21 lines).

Checked 20 Oct 2026. 67 lines, 52 unique records, 0 duplicates, 0 invalid lines, 10 ad networks detected.

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

Xandr (Microsoft) — account 7529: 1 line in the file
Amazon Publisher Services — account 3035: 1 line in the file
Criteo — accounts B-060642, B-071952: 2 lines in the file
Google AdMob — accounts pub-2725559791067351, pub-3379, pub-3844877863303739 and 4 more: 7 lines in the file
Index Exchange — accounts 192960, 183973, 184912: 3 lines in the file
OpenX — accounts 538995730, 539581285, 539710909 and 1 more: 4 lines in the file
PubMatic — accounts 164314, 164315, 164322: 3 lines in the file
Magnite (Rubicon) — accounts 11850, 17814: 2 lines in the file
Yahoo — account 100022: 1 line in the file
TripleLift — accounts 3841, 3841-EB, 1063: 3 lines in the file

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

FAQ

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

Yes — https://newyorker.com/app-ads.txt has 67 lines (checked 20 Oct 2026).

Which ad networks does newyorker.com work with?

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

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