Video Ad Serving Template

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VAST (Video Ad Serving Template) is a specification defined and released by the Interactive Advertising Bureau (IAB) that sets a standard for communication requirements between ad servers and video players in order to present video ads.

It is a data structure declared using XML.

VAST has 8 versions: 1.0 (deprecated), 1.1 (deprecated),[1] 2.0, 2.0.1(The schema version as the official VAST 2.0 schema),[2] 2.6, 3.0,[3] 4.0,[4] 4.1 and 4.2.


In order to play a video ad in a video player, the video player sends a request to a VAST ad server.

It is a simple HTTP based URL that typically appears as follows:


The ad server responds with a VAST data structure that declares these parameters:

  • The ad media that should be played
  • How the ad media should be played
  • What should be tracked as the media is played
  • The companion ad that should be displayed alongside the master ad

For example, the above request returns the following response (trimmed):

 <?xml version="1.0" encoding="utf-8"?>
 <VAST version="2.0">
    <Ad id="229">
    		<AdSystem version="4.9.0-10">LiveRail</AdSystem>
    		<AdTitle><![CDATA[LiveRail creative 1]]></AdTitle>
    		<Impression id="LR"><![CDATA[]]></Impression>
 			    <Creative sequence="1" id="331">
        	                <Tracking event="firstQuartile"><![CDATA[]]></Tracking>
                            <Tracking event="midpoint"><![CDATA[]]></Tracking>
        				    <MediaFile delivery="progressive" bitrate="256" width="480" height="352" type="video/x-flv"><![CDATA[]]></MediaFile>


  1. ^ Grenager, Teg (2012-07-19). "Video Ad Serving Template (VAST) Version 3.0" (PDF). Interactive Advertising Bureau: 8. Retrieved 2015-05-14.
  2. ^ "Digital Video Ad Serving Template (VAST) 2.0". IAB - Empowering the Marketing and Media Industries to Thrive in the Digital Economy. Retrieved 2017-06-01.
  3. ^ "Digital Video Ad Serving Template (VAST)".
  4. ^ "Digital Video Ad Serving Template (VAST)".

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