See also:
Navigation
From the menu bar at the top of your screen navigate to Campaigns > RTB Ad Sources > Inventory tab.
Within the Inventory tab you select the marketplaces - and sites within those marketplaces - where you will purchase impressions.
The Inventory tab provides four subtabs:
- Sources: Defines Marketplaces where you will purchase impressions.
- Marketplace Media: Displays a Media List of all sites in the Marketplaces selected in the Sources tab. Allows to restrict the site selection by using filter options and/or to add media to the blocklist.
- Blocklist Media: Allows to define and view your own block list of sites applied to this RTB Ad Source.
- Matched Media: Views all matched media remaining in the Marketplaces selected based on filter criteria and blocklists.
Sections
Sources tab sections

Section
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Description
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Marketplaces
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Defines Marketplaces where you will purchase impressions. Available options:
- All Marketplaces (default)
- Custom Selection: Allows to choose specific Marketplaces.
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Marketplace Media tab sections

Section
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Description
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Left panel filter options
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Allows you to restrict the site selection by using filter options. Available options:
- Media List: Opens the Media Lists search options to filter and select specific media.
- Topic: Filters based on whether a publisher blocks an advertiser by categories, which are based on the IAB standard.
- Audience: Filters based on Contextual parameters/ comScore Audience Index for specific Audience criteria.
- Primary Language: Filters based on a specific language. Available options:
- All Languages: The ad can serve regardless of the content language.
- Custom Selection: Allows to choose one or more target languages.
- Production Type: Filters based on the level of production/video quality for the ad unit played on the placement. Available options:
- Professional
- Semi-Professional
- User-Generated
- Not Declared
- Audio Start Type: Filters based on whether the video player should be initiated with audio enabled or not enabled. Available options:
- Starts With Audio
- Starts Without Audio
- Not Declared
- Initiation Type: Filters based on what causes a video to start playing on a media, which depends on whether or not users have to take action to watch videos. Options to start the video-player:
- Auto-Initiated
- User-Initiated
- Not Declared
- Placement Type: Filters based on the type of video ad unit played on the placement. Available options:
- In-Stream Video
- In-Game Video
- Interstitial Video
- Mobile App Video
- In-Banner Video
- Outstream Video
- Media-Level Reporting: If Yes is selected, filters only for publishers who do support media level reporting. In result, buyers will be able to pull a report showing impressions by domain.
- Media Type: Filters based on the type of media the buyer wants to target (Site or App).
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Search
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Filters the Media list for particular sites or media channels.
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Context menu 
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- Download to Excel
- Save the Media List to be used for future RTB Ad Sources.
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Media result list
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Displays a Media list of all sites in the Marketplaces selected under the Sources tab.(default)
Results can be filter with left panel filter options or via Search field.
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+Add to Blocklist button
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Adds a media to the list of Blocklist Media tab.
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Blocklist Media tab sections

Section
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Description
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Browse Existing Media Lists tab
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- Browses Media Lists you have created and saved in the past.
- + Add button adds the media list to the Blocklisted Media tab.
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Browse Media tab
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- Allows to filter the Media list based on following options:
- comScore Audience Index for specific Audience criteria.
- Media-Level Reporting support: If Yes is selected, filters only for publishers who do support media level reporting. In result, buyers will be able to pull a report showing impressions by domain.
- Individually by Search filter
- + Add All/+ Add buttons add all or specific media to the Blocklisted Media tab.
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Blocklisted Media tab
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- Displays all the Blocklisted Media for this RTB Ad Source (as a result of settings applied using Media Lists and Browse Media functionality.)
- Context menu
- Text Edit
- Download to Excel
- Remove All Media List
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Matched Media tab sections

Section
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Description
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Search
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Filters the Media list for particular sites or media channels.
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Context menu 
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- Download to Excel.
- Save the Media List to be used for future RTB Ad Sources.
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Media list
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- Displays all matched media remaining in the Marketplaces selected based on filtering criteria and blocklists applied in previous Inventory sub-tabs (default).
- +Add to Blocklist adds specific media to the Blocklisted Media tab.
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