4 methods

1. invoke rest method shorthand
irm ipinfo.io

2. invoke rest method
Invoke-RestMethod ipinfo.io

3. invoke rest method and only return a specific field
Invoke-RestMethod ipinfo.io/ip

4. invoke web request and print body or field from body
(Invoke-WebRequest ipinfo.io/ip).Content 

Output example:

ip       : 
hostname : 
city     : 
region   : 
country  : 
loc      : 
org      : 
postal   : 


non-powershell alternative - uses OpenDNS with command line
nslookup myip.opendns.com 208.67.222.222