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nslookup

Query name servers for various domain records. More information: https://manned.org/nslookup.

Query your system's default name server for an IP address (A record) of the domain:

nslookup {{example.com}}

Query a given name server for a NS record of the domain:

nslookup -type=NS {{example.com}} {{8.8.8.8}}

Query for a reverse lookup (PTR record) of an IP address:

nslookup -type=PTR {{54.240.162.118}}

Query for ANY available records using TCP protocol:

nslookup -vc -type=ANY {{example.com}}

Query a given name server for the whole zone file (zone transfer) of the domain using TCP protocol:

nslookup -vc -type=AXFR {{example.com}} {{name_server}}

Query for a mail server (MX record) of the domain, showing details of the transaction:

nslookup -type=MX -debug {{example.com}}

Query a given name server on a specific port number for a TXT record of the domain:

nslookup -port={{port_number}} -type=TXT {{example.com}} {{name_server}}