A TCP/IP utility on Microsoft Windows NT and Windows 2000 for diagnosing problems with name servers at the command prompt. Nslookup is installed on a computer running Windows NT or Windows 2000 when you install the TCP/IP protocol on the machine. You can use nslookup to manually display resource records in the zone files of DNS servers. The utility can operate in either an interactive or a noninteractive mode.
You enter interactive mode by typing nslookup at the command prompt. Once in the interactive running state, you can type ls -d microsoft.com to list all the resource records for the microsoft.com domain that are stored in the DNS database of the name server being queried.