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.

handelsblatt.com app-ads.txt check

handelsblatt.com achieves the best ad optimization: its app-ads.txt has no errors and matches what its 8 ad networks expect (100% of 32 lines).

Checked 19 Oct 2026. 410 lines, 258 unique records, 71 duplicates, 0 invalid lines, 10 ad networks detected.

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

Xandr (Microsoft) — account 6975: 1 line in the file
Magnite (Rubicon) — accounts 25354, 25352, 14474: 3 lines in the file
Criteo — accounts B-059192, B-059181: 2 lines in the file
Index Exchange — accounts 187580, 190867, 194764: 3 lines in the file
PubMatic — accounts 157798, 161749, 161880 and 1 more: 4 lines in the file
Amazon Publisher Services — account 3711: 1 line in the file
OpenX — accounts 556883378, 558595797: 2 lines in the file
TripleLift — accounts 6812, 6816, 6818 and 13 more: 16 lines in the file
Mintegral — partner (reseller) lines only: 12 lines in the file, 400 expected lines missing
Yango Ads — partner (reseller) lines only: 19 lines in the file, 400 expected lines missing

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

FAQ

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

Yes — https://handelsblatt.com/app-ads.txt has 410 lines (checked 19 Oct 2026).

Which ad networks does handelsblatt.com work with?

Its app-ads.txt lists Xandr (Microsoft), Magnite (Rubicon), Criteo, Index Exchange, PubMatic, Amazon Publisher Services, OpenX, TripleLift, Mintegral, Yango Ads.

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