This article describes a method to allow more than one IP address when you are using Windows on a computer with a single network adapter.

NOTE: This configuration may or may not work on your computer, and is not supported by Microsoft Product Support Services.

WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

To add additional IP addresses, use Registry Editor to edit the registry. Go to the following registry section: There should be multiple subkeys with the value 0000, 0001, and so on. If the computer has only one network adapter, click the 0000 entry. You should then see a value named IPAddress and a value named IPMask.

For each additional IP address, add to the two values.

The IPAddress value should contain the current IP addresses. This value is a string of IP addresses separated by commas with no embedded spaces. The IPMask value should be a list of comma-separated subnet masks with no embedded spaces. You must add a mask value for each IPAddress. When you are done, quit Registry Editor and then restart the computer.