IP addressing on a private, offline network.

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southerntester

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Mar 28, 2012
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Please bear with me when it comes to networking terminology as I am not in the business and know very little. I manage a network that is offline, not connected to the outside world and never will be. I am getting close to my limit of 255 devices on the IP address scheme we use. For example, let's say we use 10.10.10.1 - 10.10.10.255. Our subnet mask is 255.255.255.0. How and what do I need to change to be able to add more devices using the 10.10.10.X IP address scheme? I would like to accomplish this without adding a router or other hardware and breaking up our network. All the devices on this network need to be able to see each other. Remember to speak slowly and use small words when trying to answer my question and thanks so much.
 
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abailey

abailey

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Mar 23, 2014
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You could change your subnet mask to 255.255.0.0 and that would let use use the last 2 octets for devices. I am surprised you have not run into any performance problems with nearly 255 clients on one subnet (I would think the broadcast traffic would be getting out of hand). I guess it depends on the devices attached.
 
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southerntester

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Mar 28, 2012
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A couple questions about this: Would all the devices still be able to communicate with each other even though they are on different subnets?

What would the ip address and subnet mask be for the next couple devices? Thanks...
 
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abailey

abailey

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They would be on the same subnet. Since you changed your subnet mask to 255.255.0.0 that means anything that starts with 10.10 is on the same subnet. So you could start your next client like at 10.10.9.1, 10.10.9.2, etc. As long as the first 2 octets are the same (10.10) then you can use the second 2 octets for clients and all be on the same subnet. Your changing you addressing from a class c subnet to a class b subnet when you change your subnet mask from 255.255.255.0 to 255.255.0.0. Just make sure you change the subnet for everything to 255.255.0.0, this includes existing clients and hardware.
 
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