One way to determine the public
IP address
for a system, i.e., the IP address that systems on the Internet will see for the
system when you connect to those external systems, from a
command-line interface (CLI) on a
Linux or
Mac OS X/macOS
system is to use the
dig
command dig +short myip.opendns.com @resolver1.opendns.com.
E.g.:
$ dig +short myip.opendns.com @resolver1.opendns.com 137.103.94.167 $
Alternatively, you can use an nslookup command as shown below:
$ nslookup myip.opendns.com resolver1.opendns.com Server: resolver1.opendns.com Address: 208.67.222.222#53 Non-authoritative answer: Name: myip.opendns.com Address: 137.103.94.167 $
The nslookup method will work on Microsoft Windows systems as well as OS X/macOS and Linux sysems.
c:\Users\Public\>nslookup myip.opendns.com resolver1.opendns.com Server: resolver1.opendns.com Address: 208.67.222.222 Non-authoritative answer: Name: myip.opendns.com Address: 137.103.94.167 c:\Users\Public\>
Both commands submit a Domain Name System (DNS) query to the DNS server resolver1.opendns.com, a name server maintained by OpenDNS. When you look up the fully qualified domain name (FQDN) myip.opendns.com, the OpenDNS server will return the IP address of the system from which the DNS query originated, i.e., the system on which you ran the dig or nslookup command.
