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Mobile Understitial


The mobile understitial lets the user look through a gap in the content to a large-scale customer visual behind it. It is a relatively discreet ad format that is easy for the customer to realize and deliver thanks to simple material requirements. However, it still has an attention-grabbing ad special character due to a parallax effect and the feeling of transparency or optical depth.


200 kB initially, max. 4 MB in second load (polite load)
More information about the various load stages can be found in our HTML5 Guidelines.

Media delivery format

HTML5, JavaScript-Redirect

Redirect/Tracking requirements

When using Flashtalking, Sizmek or Adform, please use only the service provider's template certified with us for this ad. In case of uncertainty, please consult with your 3rd party service provider.


All URL-based components of an advertising medium (e.g. redirect, pixel tracker) must contain the IAB macro gdpr_consent=${GDPR_CONSENT_XXX} to process the TC string, where XXX is the numerical vendor ID according to the global vendor list of the IAB.

Pixeltracker without IAB macro of a vendor with ID 123:
This Pixeltracker incl. IAB macro:${GDPR_CONSENT_123}

More Information: here

Standard format

responsive with width: 100% and height: 100%


The standard is 1 motif per booked placement. In the case of a motif split, a limit of max. 3 motifs per placement is to be taken into account, and 1 motif change per week in the case of physical delivery.
Ad Alliance reserves the right to approve each motif on a case-by-case basis. Ads that elicit too strong a reaction or too heavily impair the use of the websites may be rejected.
As of 5 items per campaign, a maximum of 1 motif/day/redirect per item is possible. That is why we recommend delivering several motifs behind one redirect.

Lead time

3 working days

Media delivery


Anke Panke
Tel.: +49 40 2866 86 43 17

Reinhold Beny
Tel.: +49 40 2866 86 43 16


For correct positioning on different devices, we recommend responsive ads.

In the case of non-responsive ads, the following sizes should be considered:
Portrait: 320 x 480 px (or 640 x 960 px Retina resolution).
Landscape: 480 x 320 px (or 960 x 640 px Retina resolution)

For redirects, the output size in Retina format must always be 320 x 480 px for Portrait and 480 x 320 px for Landscape.

HTML5 Guidelines
HTML5 Guidelines
Tracking Guidelines
Tracking Guidelines
Most recent amendment