All about Unique Impressions

Unique Impressions or uniqueness is calculated over the live time (online duration) of the flight or campaign, which is, Start date to End date for each flight and campaign.

Brand Central tracks unique impressions using a separate cookie for each flight and campaign. If a visitor visits two publisher websites with different flights in the same campaign by the same client, BC counts ONE unique impression at the campaign level, and one EACH unique impression at the flight level. Thus, the count for campaign level will always be low compared with flight level.

Campaign level screen shot :

Flight level screen shot :

128-bit encoding is the character limit for any landing page URL in Brand Central