Need more IP addresses

Hi,

I have a single subnet 192.168.20.0, network mask 255.255.255.0
There are about 200 IP addresses in use, and I have a lot of new equipment coming that needs IP addresses.
My network understanding is a bit sketchy. I know that I can achieve more addresses by putting part of the network onto a different IP range and routing between them. I've done that before, but that was for a different location within the company and was achieved using a VPN router that also acted as a DHCP server.
Is the segmenting best done at a convenient physical part of the network (ie put all the devices attached to one cabinet onto a different IP range)? In which case how do the devices at that part of the building get a different IP from the DHCP server?

Thanks,
S

.

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