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How To Check Router Modem IP Address That Given By ISP?

Most of the home broadband Internet packages assign dynamic IP to xDSL modem to access the Internet.

This dynamic IP address, a.k.a. public IP, WAN IP, or Internet IP, is the only IP address that “talks” to the Internet. Needless to say, this public IP is different from private IP address that you can find in the ipconfig command in Windows Vista or ifconfig command in Ubuntu / Linux machines that connecting the Internet via a xDSL router modem.

Suppose I am connecting to Internet via ISP A or you’re connecting to Internet via ISP B, both are using a router modem. I cannot ping or VNC your machine if you give me the private IP address that taken from ipconfig or ifconfig in the computer.

It’s only possible if you give me the router modem IP address, i.e. the real Internet IP address given by ISP B. (Of course, you must also configure the port forwarding in router modem before I can VNC your machine via that WAN IP address).

So, if it’s not the ipconfig in Windows or ifconfig in Ubuntu / Linux, what is the command to check the real WAN IP address of your router modem?

How to check the Internet IP address of router modem?

Here are some of the ways to find out the Internet IP address of a router modem (or the proxy server in your office).

1) Simply open up your favourite web browser and browse to http://who.is. There is your router modem IP address, i.e. the so-called Internet IP address assigned dynamically by the ISP DHCP server (as shown in the following screenshot, highlighted in blue, marked by a red arrow):

How to find out what Internet IP address is given by your ISP DHCP server to the router modem?
How to find out what Internet IP address is given by your ISP DHCP server to the router modem?

2) Login to your router modem and look for the WAN related information page.

3) Login to Gmail and check the Details page of Google Account activities.

4) Ask Google for list of Internet IP checker.

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