nslookup port number
nslookup followed by the domain name will display the âA Recordâ ( IP Address ) of the domain. $ nslookup redhat.com Server: 192.168.19.2 Address: 192.168.19.2#53 Non-authoritative answer: Name: redhat.com Address: 209.132.183.181. In the above output, server refers to the IP address of the DNS server. Then the below section provides the âA Recordâ ( IP Address ) of the domain âredhat.comâ.