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.

mobile.udn.com app-ads.txt check

mobile.udn.com achieves the best ad optimization: its app-ads.txt has no errors and matches what its 6 ad networks expect (100% of 11 lines).

Checked 20 Oct 2026. 214 lines, 186 unique records, 4 duplicates, 0 invalid lines, 12 ad networks detected.

Ad networks in mobile.udn.com/app-ads.txt

Google AdMob — accounts pub-2335763024933651, pub-9378724246417115, pub-4338256439626145 and 8 more: 11 lines in the file
Yahoo — account 59109: 1 line in the file
Xandr (Microsoft) — account 9393: 1 line in the file
Magnite (Rubicon) — accounts 24872, 24874, 24482 and 3 more: 6 lines in the file
Criteo — account B-068838: 1 line in the file
Index Exchange — account 190167: 1 line in the file
Mintegral — partner (reseller) lines only: 21 lines in the file, 400 expected lines missing
Chartboost — partner (reseller) lines only: 17 lines in the file, 400 expected lines missing
Yango Ads — partner (reseller) lines only: 35 lines in the file, 400 expected lines missing
DSP Exchange — partner (reseller) lines only: 25 lines in the file, 400 expected lines missing
Verve (PubNative) — partner (reseller) lines only: 11 lines in the file, 400 expected lines missing
Bidmachine — partner (reseller) lines only: 30 lines in the file, 400 expected lines missing

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

FAQ

Does mobile.udn.com have an app-ads.txt?

Yes — https://mobile.udn.com/app-ads.txt has 214 lines (checked 20 Oct 2026).

Which ad networks does mobile.udn.com work with?

Its app-ads.txt lists Google AdMob, Yahoo, Xandr (Microsoft), Magnite (Rubicon), Criteo, Index Exchange, Mintegral, Chartboost, Yango Ads, DSP Exchange, Verve (PubNative), Bidmachine.

Is the app-ads.txt of mobile.udn.com correct?