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.

thestar.com app-ads.txt check

thestar.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 20 Oct 2026. 363 lines, 324 unique records, 35 duplicates, 1 invalid lines, 20 ad networks detected.

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

Google AdMob — accounts pub-8188431425509997, pub-1995032544933848: 2 lines in the file
Amazon Publisher Services — accounts 5028, 7e04e82e-6020-43fc-bcea-5ccf1f410a88, 661990cc-08cb-45bb-9ee2-90c2a9034640: 3 lines in the file
Magnite (Rubicon) — accounts 17214, 18512, 18488 and 1 more: 4 lines in the file
Index Exchange — accounts 184999, 186187, 213091 and 3 more: 6 lines in the file
Xandr (Microsoft) — accounts 7541, 11075, 9586: 3 lines in the file
OpenX — accounts 537120530, 541002036, 560835534 and 3 more: 6 lines in the file
Sovrn — accounts 239073, 239073-eb, 249812 and 4 more: 7 lines in the file
Smaato — accounts 1100047548, 1100047290: 2 lines in the file
PubMatic — accounts 159272, 161383, 159271 and 3 more: 6 lines in the file
TripleLift — accounts 4260, 4260-EB, 8345: 3 lines in the file
Mintegral — partner (reseller) lines only: 20 lines in the file, 400 expected lines missing
Chartboost — partner (reseller) lines only: 15 lines in the file, 400 expected lines missing
BIGO Ads — partner (reseller) lines only: 21 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: 29 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: 20 lines in the file, 400 expected lines missing
CAS.ai — partner (reseller) lines only: 10 lines in the file, 155 expected lines missing
DSail — partner (reseller) lines only: 10 lines in the file, 155 expected lines missing
Bidmachine — partner (reseller) lines only: 32 lines in the file, 400 expected lines missing

Invalid lines

appnexus.com, 12290, RESELLER f5ab79cb980f11d1

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

FAQ

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

Yes — https://thestar.com/app-ads.txt has 363 lines (checked 20 Oct 2026).

Which ad networks does thestar.com work with?

Its app-ads.txt lists Google AdMob, Amazon Publisher Services, Magnite (Rubicon), Index Exchange, Xandr (Microsoft), OpenX, Sovrn, Smaato, PubMatic, TripleLift, Mintegral, Chartboost and 8 more.

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