Is there an easy way (like via a .Net library) that allows me to get the IP address and subnet mask of the local machine that the application is running on?

I have an Excel spreadsheet containing IP addresses and subnet masks. I need to derive the subnet of each IP address in the spreadsheet.Example: IP (column A): 10.1.230.84, Subnet Mask (column B ...

How to find your local and public IP address in a web browser If you ever need to know your computer's external IP address, it's very easy to track down: Open a browser and visit WhatIsMyIP.com.