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.

rtl.de app-ads.txt check

rtl.de is missing out on higher CPMs: its app-ads.txt has 2 invalid lines. Buyers' crawlers skip invalid lines, so those sellers can't be verified.

Checked 19 Oct 2026. 558 lines, 540 unique records, 16 duplicates, 2 invalid lines, 16 ad networks detected.

Ad networks in rtl.de/app-ads.txt

Amazon Publisher Services — accounts 3493, 7071406c-0ffd-423e-87e5-da06d18c5cc9: 2 lines in the file
Google AdMob — account pub-9519890336884096: 1 line in the file
OpenX — account 539902333: 1 line in the file
Magnite (Rubicon) — accounts 21958, 23864, 23866 and 1 more: 4 lines in the file
PubMatic — account 161364: 1 line in the file
Index Exchange — account 210574: 1 line in the file
Mintegral — partner (reseller) lines only: 21 lines in the file, 400 expected lines missing
Liftoff Monetize (Vungle) — partner (reseller) lines only: 10 lines in the file, 380 expected lines missing
Chartboost — partner (reseller) lines only: 19 lines in the file, 400 expected lines missing
DT Exchange (Fyber) — partner (reseller) lines only: 11 lines in the file, 400 expected lines missing
BIGO Ads — partner (reseller) lines only: 20 lines in the file, 400 expected lines missing
Yango Ads — partner (reseller) lines only: 53 lines in the file, 400 expected lines missing
DSP Exchange — partner (reseller) lines only: 35 lines in the file, 400 expected lines missing
Maticoo (zMaticoo) — partner (reseller) lines only: 20 lines in the file, 400 expected lines missing
Verve (PubNative) — partner (reseller) lines only: 16 lines in the file, 400 expected lines missing
Bidmachine — partner (reseller) lines only: 45 lines in the file, 400 expected lines missing

Invalid lines

pubmatic, 162439, RESELLER
pubmatic, 162439, reseller, 5d62403b186f2ace

Corrected file: rtl.de app-ads.txt (fixed).

FAQ

Does rtl.de have an app-ads.txt?

Yes — https://rtl.de/app-ads.txt has 558 lines (checked 19 Oct 2026).

Which ad networks does rtl.de work with?

Its app-ads.txt lists Amazon Publisher Services, Google AdMob, OpenX, Magnite (Rubicon), PubMatic, Index Exchange, Mintegral, Liftoff Monetize (Vungle), Chartboost, DT Exchange (Fyber), BIGO Ads, Yango Ads and 4 more.

Is the app-ads.txt of rtl.de correct?