Network Running low on IP Addresses


I need some advice regarding IP ranges for one of our networks.
We have a network which is getting bigger and bigger and we are running seriously low on IP addresses.

The main LAN is on IP range 10.0.0.x with a subnet of
We have a IP Phone Vlan which we run on 10.0.1.x with a subnet of
Backup network runs on 10.0.3.x with a subnet of
Other networks on 10.0.4.x and 10.0.5.x all with subnet of

The issue I have is the main LAN on IP range 10.0.0.x I am nearly out of IP addresses and need to expand this.  I would like to avoid having to change anything on vlan2 which is running a Mitel phone system as this was quite complex to setup when it first went in from Mitel.

Ideally I would like to put all the PCs onto a separate range as these would be the easiest to move without having to reconfigure any servers, DNS, AD etc.

I have never had to do this before could someone advice on the best way of doing this or if there is a better way to increase the scope.

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Zephyr ICTCloud ArchitectCommented:
How are these networks interacting at the moment? Are they separate (routed) VLANs?

You can maybe create 1 big network, for example, that would give you a range from up to
That way you could keep current setup as if this large network was subnetted into separate /24 ranges.

This way you could leave your servers on the main LAN (10.0.0.x) and move your clients to, or some other valid range of the larger subnet. You'd have to adjust some gateways and maybe some routing, depending on the setup.

Or, another option, start a new subnet from and make it as large as you want, move everything from your default LAN to this new subnet and adjust routing, gateways and such ...

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I would suggest you move your PCs from 10.0.0.x ( to, say, 10.1.x.y (

This will not 'clash' with any existing IPs, but will give you a 16,384 (less some unusables) address space, rather than your current 256 (less two unusables) you currently have.

You'll need to adjust routing between the VLANs, but it should be fairly easy to edit those configs / files.

Does that help?

AkinsdNetwork AdministratorCommented:
I would recommend /23 or at the most /22 to avoid congestion issues or slow network traffic. You may also consider breaking your network up by department or location
Natty GregIn Theory (IT)Commented:
What they said above
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