A system includes a processing system of a device including one or more processors. The system also includes a memory system including one or more computer-readable media. The one or more computer-readable media contain instructions that, when executed by the processing system, cause the processing system to perform operations. The operations include reading, at a domain name system (DNS) server, top-level domain (TLD) information from a TLD list. The operations also include sizing data structures for a hash table. The operations also include loading the TLD information into the hash table. The operations also include determining whether a collision constraint is met in the hash table. The operations also include increasing a size of the data structures when the collision constraint is not met.