What Is An External IP Address?

Answer : This is the address or addresses given to you from your Internet Service Provider (ISP). They can tell you what your address or addresses are and what type they are (static vs. dynamic).

It is possible to find out your current external IP address by using available web utilities such as http://www.whatismyip.com.  However, it is up to each merchant to determine any IP addresses that expose their card processing environment to the Internet.