If I want just 1 device to be on the network, can I set the subnet mask to

For example, the consider the network card configuration

IP mask Gateway will be the only device in the network talking to the gateway? Is there a problem with this configuration?

  • 6
    A device and a gateway... isn't that two devices?
    – Jaydee
    Commented Sep 17, 2014 at 14:08
  • Did any answer help you? if so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. Alternatively, you could post and accept your own answer.
    – Ron Maupin
    Commented Jan 4, 2021 at 18:11

3 Answers 3


Yes, there's a problem. Your default gateway needs to be in the same subnet as your device. By setting the subnet mask to, you've told the computer that nothing else is in its subnet. A more appropriate way to do things would be to set your device IP to, your gateway to, and your subnet mask to


There are two machines in your subnet pc + gateway, so you should set up at least /30 mask ( and the proper network of course. Cheers.


A device address 32-bit mask cannot have a gateway; it must be routed. Typically, 32-bit masks are used on loopback addresses.

If you are attempting to have a point-to-point link, you may use a 31-bit mask, per RFC 3021, Using 31-Bit Prefixes on IPv4 Point-to-Point Links.

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