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Adding More than Five IP Addresses to NIC in Windows NT

This article was previously published under Q149426
This article has been archived. It is offered "as is" and will no longer be updated.
Ordinarily, you can set up to five IP addresses per network cardinstalled, under the settings for TCP/IP (in Control Panel, double-clickthe Network icon, then click the Protocols tab; on the Protocols tab,select TCP/IP Protocols, then click the Properties button; on the IPAddress tab, click Advanced...). However, it is possible to add more thanfive IP addresses to a network card by modifying the registry.

Windows NT 4.0 has no limitation on the number of IP addresses that can bebound to a NIC. The limitation is on system resources.
Use the Registry Editor (REGEDT32.EXE) to add your IP addresses and subnetmasks, as follows:

WARNING: Using Registry Editor incorrectly can cause serious,system-wide problems that may require you to reinstall Windows NT tocorrect them. Microsoft cannot guarantee that problems resultingfrom the use of Registry Editor can be solved. Use this tool at yourown risk.
  1. Start REGEDT32.EXE and locate the following Registry subkey:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\<Adapter Name>\Parameters\Tcp
  2. Find the IPAddress value and double-click it.
  3. The Multi-String Editor dialog box should appear with the IP addressselected. Type each additional IP address on a new line within thedialog box, then click OK. For example:
  4. Find the SubnetMask value and double-click on it.
  5. The Multi-String Editor dialog box should appear with the Subnet Maskselected. Enter each additional subnet mask on a new linewithin the dialog box, then click OK. For example:

    IMPORTANT: The order of the IP addresses and subnet masks mustcorrespond.
  6. Exit REGEDT32.
  7. Exit Windows NT and restart your computer.
You should have all of the IP addresses specified in the registry boundto your network cards.
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Article ID: 149426 - Last Review: 12/04/2015 14:29:27 - Revision: 1.1

Microsoft Windows NT Workstation 3.51, Microsoft Windows NT Workstation 4.0 Developer Edition, Microsoft Windows NT Server 3.51, Microsoft Windows NT Server 4.0 Standard Edition

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