The WAN address may be found using a website if you need to find it quickly or using a router to be sure you get the right address.

How to Find Secondary DNS Servers on Web Addresses. A Web server that can't find anything on the Internet isn't of much use. This situation is especially relevant if the Web server in question is ...

An IP address is an Internet Protocol address: It works a bit like a postal address does for the place where you live, enabling websites and web servers to find you and maintain a working connection.