check the public ip address

Open up the terminal and sent a quick request to the ipify.

curl "https://api.ipify.org?format=json"

The services will sent a json reply with the public ip address.

{"ip":"161.142.159.51"}

trace the ip address route

Using terminal and command traceroute we can check the route it took for the network to reach this ip address.

Install traceroute if not available

On Mac OS

brew install traceroute

On Debian based Linux

apt install traceroute

Once the installation was done use traceroute to get the list of gate the network pass.

traceroute <public ip address>

If there's not private IP like gate used to reach the destination public IP then most likely the IP have direct connection to the internet and not behind any public IP pool CGNAT.

traceroute to 161.142.157.51 (161.142.157.51), 64 hops max, 52 byte packets
 1  192.168.1.1 (192.168.1.1)  4.506 ms  3.485 ms  3.281 ms
 2  10.35.208.1 (10.35.208.1)  5.459 ms  7.461 ms  9.485 ms
 3  * * *
 4  * * *
 5  * * *
 6  * * *
 7  * * *
 8  * * *
 9  * * *
10  * * *

Example above this IP most likely assigned thru CGNAT.