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.

netgem.co.uk app-ads.txt check

netgem.co.uk achieves the best ad optimization: its app-ads.txt has no errors and matches what its 6 ad networks expect (100% of 9 lines).

Checked 24 Oct 2026. 268 lines, 208 unique records, 46 duplicates, 0 invalid lines, 10 ad networks detected.

Ad networks in netgem.co.uk/app-ads.txt

PubMatic — accounts 162307, 163018, 159884: 3 lines in the file
Google AdMob — accounts pub-8163703492351455, pub-2820106580337289: 2 lines in the file
TripleLift — account 11731: 1 line in the file
Magnite (Rubicon) — account 22426: 1 line in the file
Index Exchange — account 191349: 1 line in the file
Amazon Publisher Services — account 72fbd829-b97d-40dd-973b-62e4a41f0fc8: 1 line in the file
Chartboost — partner (reseller) lines only: 13 lines in the file, 400 expected lines missing
BIGO Ads — partner (reseller) lines only: 11 lines in the file, 400 expected lines missing
Yango Ads — partner (reseller) lines only: 22 lines in the file, 400 expected lines missing
Bidmachine — partner (reseller) lines only: 14 lines in the file, 400 expected lines missing

Corrected file: netgem.co.uk app-ads.txt (fixed).

FAQ

Does netgem.co.uk have an app-ads.txt?

Yes — https://netgem.co.uk/app-ads.txt has 268 lines (checked 24 Oct 2026).

Which ad networks does netgem.co.uk work with?

Its app-ads.txt lists PubMatic, Google AdMob, TripleLift, Magnite (Rubicon), Index Exchange, Amazon Publisher Services, Chartboost, BIGO Ads, Yango Ads, Bidmachine.

Is the app-ads.txt of netgem.co.uk correct?