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Using more then 254 IP addresses on same network (multiple subnets)

I have a client who has 90 network drops. They go into multiple offices. The idea is that they will be leasing office space to small companies/non-profit organizations.

 We will be using a NETGEAR FVX538 router.

My problem is this. Some of those office areas may have 3-4 computers, and then maybe 1 printer and maybe a vonage device, so thats about 5-6 IP's for one office. As you can imagine we'd run out of useable IP addresses on our standard 192.168.1.xxx network.

Is there a way I can span across multiple subnets to assign more ip's say a range of:

192.168.1.xxx - 192.168.2.xxx which will give me roughly 500+ ip's I can use?

I know it can be done, my main question is: How do I do this, as i've never really used more then 1 subnet before. What settings should I use. Its a brand new network, nothing installed on it yet.
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This article will be a good help for you, just try:
HOW TO CREATE A SUBNET is not that easy to comlete in one sitting but this link can give you VERY GOOD OVERVIEW:
I would say to configure the router for class B operation (by setting its LAN-side mask to instead of and use a class B IP address like - this would give you 65533 addresses instead of 253. However, I took a quick look at your router spec, and it does say it supports only 253 users, so it may not support class B operation on the LAN side.. In our office we can have up to 4 local subnets (eg 192.168.1.xxx, 192.168.2.xxx etc) on our Draytek 2900 router, but I didn't see any facility for virtual LAN's on your router's spec.. I think you should phone Netgear and avail yourself of their technical support..
In the beginning all IP addresses are grouped in classes A (mask8), B (mask16), C (mask24). These days most network devices, including computers NIC, are capable to subnet or supernet addresses.
What you want is supernets 2 class C. Your 192.168.1.x-192.168.2.x  happens not to be in the same subnet in mask 23 (which contain double as much hosts of mask24).
If you google on IPCALC, you will find some online tools to calculate.
Address:           11000000.10101000.0000000 1.00000000
Netmask: = 23    11111111.11111111.1111111 0.00000000
Wildcard:             00000000.00000000.0000000 1.11111111
Network:        11000000.10101000.0000000 0.00000000 (Class C)
Broadcast:         11000000.10101000.0000000 1.11111111
HostMin:           11000000.10101000.0000000 0.00000001
HostMax:         11000000.10101000.0000000 1.11111110
Hosts/Net: 510                   (Private Internet)

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