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Now they have 230 devices and They are going to increase device count by 100.
Within the same subnet? Then you'd have to supernet that subnet to e.g. 192.168.24.0/23.
I cannot change subnet and increased usable IP addresses count because there are many dependencies.
Adding another subnet/VLAN is a better option anyway. As Jesse's already answered, that ...
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Questions about protocols above layer 4 are off limits here, however, as a very basic explanation on a layer 2 and layer 3 level, you cannot have multiple VLANs using the same DHCP pool (same subnet). Each VLAN would need a separate DHCP pool (separate subnet) to assign addresses from.
For example:
VLAN 100: 192.168.1.0/24
VLAN 200: 192.168.2.0/24
Just to ...
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you could add a second range to another vlan. If the switch is a layer 3 switch, it shouldn't be a problem to connect to eachother. If not, a downtime is necessary to adapt the existing one.
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