1. A computer implemented method for hybrid address translation in a computer, the method comprising: receiving a first address, the first address referencing a location in a first address space; searching, by the computer, a segment lookaside buffer (SLB) for a SLB entry corresponding to the first address, the SLB entry comprising a type field and an address field; determining whether a value of the type field in the SLB entry indicates a hashed page table (HPT) search or a radix tree search; based on determining that the value of the type field indicates the HPT search, searching a HPT to determine a second address, the second address comprising a translation of the first address into a second address space; and based on determining that the value of the type field indicates the radix tree search, searching a radix tree to determine the second address.