Is there any AdMob dummy id?

OS: Android

Mediation: Admob

For Banner Ads:

ca-app-pub-3940256099942544/6300978111

Source

For Interstitial Ads:

ca-app-pub-3940256099942544/1033173712

Source

For Admob NativeExpress Ads:

ca-app-pub-3940256099942544/1072772517

For Rewarded Video

ca-app-pub-3940256099942544/5224354917

Note:

The NativeExpressAd you'll see looks like a real one, but it's counted as a test ad. You're free to use that ad unit ID for your testing.

by Andrew Brogdon (Google Ads Team in one of his youtube comments)

enter image description here

All test Ads you can find in the actual admob github repository in the res > values > strings.xml

Banner:

ca-app-pub-3940256099942544/6300978111

Interstitial:

ca-app-pub-3940256099942544/1033173712

Rewarded Video:

ca-app-pub-3940256099942544/5224354917

Native Advanced:

ca-app-pub-3940256099942544/2247696110

Native Advanced Video:

ca-app-pub-3940256099942544/1044960115

Native Express Small/Large:

ca-app-pub-3940256099942544/2793859312 
ca-app-pub-3940256099942544/2177258514

source

This is the dummy id for Banner ads.

ca-app-pub-3940256099942544/6300978111

source

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