Definitions for "Second Level Domain"
Keywords:  underneath, sld, hierarchy, tld, cctld
The alphanumeric string before the dot and the TLD. AusRegistry administers all domains within the .com, .net, .org, .id and .asn 2LD's that exist within the .au TLD. 2LD's are also called domain types within the Australian registry system.
a sub-section of a Top Level Domain (TLD) in the Domain Name System
An "SLD" is a second-level domain of the DNS.