Abstract: Content can be delivered to devices via one or more networks based on clusters of attributes in some examples. As one particular example, a server can determine a first set of attributes corresponding to a cookie associated with an entity and determine a second set of attributes corresponding to a mobile advertiser identifier (MAID) associated with the entity. The server can generate a cluster of attributes for the entity based on the first set of attributes and the second set of attributes. The system can then receive audience definition criteria defining a target audience for content and determine whether the cluster of attributes satisfies the audience definition criteria. If the cluster of attributes satisfies the audience definition criteria, the server can designate the cookie and the MAID as belonging to the target audience to enable the content to be delivered to the entity.