nslookup

Query name server(s) 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}}