Dig

dig +noall +answer -t NS target.com      #Fetch name servers

dig +noall +answer -t MX target.com    #Fetch exchange servers

dig +noall +answer -t ANY target.com @ns.target.com   #Interrogate a specified domain name server

dig +noall +answer -t AXFR target.com @ns.target.com  #Fetch the zone file for a specified domain name server

dig +noall +answer -x 192.168.8.5    #Reverse DNS lookup