1. A computer-implemented method of analyzing network traffic related to domain names, comprising: storing network traffic data associated with DNS requests for NXDs; receiving an analysis request associated with at least one identified domain name; creating, based on the stored network traffic data, an NXD list comprising NXDs that received at least one DNS request during a time period; computing, based on the stored network traffic data, a similarity metric for each NXD listed in the NXD list; and providing an analysis report identifying potentially valuable NXDs based on the computed similarity metrics.