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.

washingtonpost.com app-ads.txt check

washingtonpost.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 21 Oct 2026. 300 lines, 262 unique records, 11 duplicates, 1 invalid lines, 25 ad networks detected.

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

Google AdMob — accounts pub-3980300725513096, pub-0231639411043846: 2 lines in the file
PubMatic — accounts 157050, 156416: 2 lines in the file
Index Exchange — accounts 183960, 184966, 216203 and 1 more: 4 lines in the file
Magnite (Rubicon) — accounts 17302, 12890: 2 lines in the file
OpenX — accounts 537154106, 539044014, 564209862: 3 lines in the file
Amazon Publisher Services — account be6d001d-1c56-4a9c-9dca-7c02b3daa060: 1 line in the file
TripleLift — accounts 3015, 3015-EB, 2936: 3 lines in the file
Yahoo — account 58494: 1 line in the file
AppLovin — partner (reseller) lines only: 9 lines in the file, 26 expected lines missing
Mintegral — partner (reseller) lines only: 56 lines in the file, 400 expected lines missing
Unity Ads — partner (reseller) lines only: 11 lines in the file, 149 expected lines missing
ironSource / LevelPlay — partner (reseller) lines only: 12 lines in the file, 113 expected lines missing
Liftoff Monetize (Vungle) — partner (reseller) lines only: 35 lines in the file, 355 expected lines missing
Chartboost — partner (reseller) lines only: 65 lines in the file, 400 expected lines missing
DT Exchange (Fyber) — partner (reseller) lines only: 31 lines in the file, 400 expected lines missing
Yandex Ads — partner (reseller) lines only: 10 lines in the file, 158 expected lines missing
BIGO Ads — partner (reseller) lines only: 44 lines in the file, 400 expected lines missing
Yango Ads — partner (reseller) lines only: 100 lines in the file, 400 expected lines missing
DSP Exchange — partner (reseller) lines only: 27 lines in the file, 400 expected lines missing
Maticoo (zMaticoo) — partner (reseller) lines only: 18 lines in the file, 400 expected lines missing
Verve (PubNative) — partner (reseller) lines only: 49 lines in the file, 400 expected lines missing
HyprMX — partner (reseller) lines only: 25 lines in the file, 344 expected lines missing
CAS.ai — partner (reseller) lines only: 11 lines in the file, 154 expected lines missing
DSail — partner (reseller) lines only: 11 lines in the file, 154 expected lines missing
Bidmachine — partner (reseller) lines only: 67 lines in the file, 400 expected lines missing

Invalid lines

conversantmedia.com, 101272, DIRECT/RESELLER, 03113cd04947736d

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

FAQ

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

Yes — https://washingtonpost.com/app-ads.txt has 300 lines (checked 21 Oct 2026).

Which ad networks does washingtonpost.com work with?

Its app-ads.txt lists Google AdMob, PubMatic, Index Exchange, Magnite (Rubicon), OpenX, Amazon Publisher Services, TripleLift, Yahoo, AppLovin, Mintegral, Unity Ads, ironSource / LevelPlay and 13 more.

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