How to determine if my IP address is public

You can use (or any similar service). You will be shown the IP address that was used for accessing the site; and if it matches the IP address that your Internet service provider assigned you, then you have a public IP address.

There are three class of IP addresses for intranet IP addresses. If your IP address is detected in the following range, that’s mean you do not have a public IP address. Please contact your internet service provider. (A class) (B class) (C class)