US Patent 11249999 Memory efficient searching

Methods and apparatus for determining if a value is stored in a hash table is provided. The method includes breaking the value into address bits, prefix bits, and signature bits. The method includes determining a container in a compressed index at an address specified by the address bits, the container comprised of a prefix table with bits set corresponding to the prefix bits determined by aggregate values associated with the container and a signature table containing the signature bits determined by the aggregate values associated with the container. The method includes determining a result based on a function of the prefix and signature tables and the determined prefix and signature bits.