Hi, yup, you could take a Class C address and reduce the mask if you wish, known as Supernetting. and also you can summarize ( CIDR ) address ranges on routers to cover routes for ranges of Class C.
I.E
192.168.0.0 /24 ( Class C ) = around 254 nodes
192.168.1.0 /24 ( Class C ) = around 254 nodes
Supernet to
192.168.0.0 /23 = around 512 nodes
Range
192.168.0.0 to
192.168.1.254
OR
192.168.0.0 /22 = around 1024 nodes
Range
192.168.0.0 to
192.168.3.254
On a router, If you have 4 class C address routes
192.168.0.0 /24
192.168.1.0 /24
192.168.2.0 /24
192.168.3.0 /24
Instead of having 4 separate routes in the routing table you could use CIDR and have one entry representing the whole range
192.168.0.0 /22
Of couse the same applies with class B`s, A`s etc...
LEEroy
MCNE6,CCNA2,CWNA, Project+