How do I view my networks Subnet Mask?

  1. Open the Windows command line (DOS).
  2. At the command line type ipconfg and press enter. Which gives you your Windows IP configuration as shown below.

Windows command line running ipconfig

Within this command output you'll see the local Subnet Mask address, as shown above as 255.255.255.0. For most home and network users this will by your Subnet Mask address. Keep in mind that this is your local network Subnet Mask. If you're connecting to the Internet and want to view the Subnet Mask your ISP is using you'll need to view the properties of your network router through the router setup.

Additional information

  • See our Subnet Mask definition for additional information about each of these terms.