How can I check the IP address on my Mac?

Your current Mac's IP address is viewable in Apple -> About this Mac ->System Report -> Network.

Note that this is not necessarily - and usually isn't - your public IP address.

System Preferences > Network > IP Address:

For your ISP external address, launch Terminal and enter the following:

/usr/bin/dig +short myip.opendns.com @resolver1.opendns.com

External IP address and location

https://www.geolocation.com