%sudoifconfig en0 alias 10.254.254.254 255.255.255.0

• Go to Control Panel → Network and sharing center
• Click "change adapter settings" on the left
• Right click on your local network connection and go to properties
• Select your TCP/IP v4 protocol and click properties
• TCP must be set to static addressing, so set it to "Use the following address" and set up your default IP config for the network. Then click advanced.
• Under IP Address in Advanced TCP/IP settings, click Add
• Add extra IP addresses as needed