A content delivery network aggregator system is disclosed. A user requesting content from a content provider has his or her DNS request forwarded to a CDN selector. The CDN selector intelligently selects an optimal CDN from amongst a number of partner CDNs to provide the requested content. The CDN selector selects one of the plurality of content delivery networks for providing content to a user based upon an analysis of a plurality of performance variables for each of the plurality of content delivery networks.