nslookup (from name server lookup) is a network administration command-line tool for querying the Domain Name System (DNS) to obtain the mapping between domain name and IP address, or other DNS records.

Andrew Cherenson created nslookup as a class project at UC Berkeley in 1986 and it first shipped in 4.3-Tahoe BSD[1] In the development of BIND 9, the Internet Systems Consortium planned to deprecate nslookup in favor of host and dig.

This decision was reversed in 2004 with the release of BIND 9.3[2] and nslookup has been fully supported since then.

[4] The ReactOS version was developed by Lucas Suggs and is licensed under the GPL.

The non interactive mode searches the information for a specified host using the default name server.