Using Control Panel / Network, you can bind 5 IP addresses to your NIC.
Windows NT has no physical limit. To add more, use Regedt32 to browse to:
Double-click on the IPAddress value name. This is a type REG_MULTI_SZ entry. Add each IP address on a new line.
Double-click on the SubnetMask value name. This is a type REG_MULTI_SZ entry. Add each subnet mask on a new line.
Note: The order of the IP addresses and subnet masks must correspond.
Restart your computer.