LAN IP addresses

Hi,

I am not a specialist on network, but I have a network on
192.168.0.0 / 255.255.255.0

I fear not to have enough IP addresses. I know, that the solution would
be to get another router and to get a second sub-network.

I just wonder if I change my LAN ( 192.168.0.x/255.255.255.0 ) to
192.168.x.x / 255.255.0.0
- Would it be possible to do that ?
- Would it get me all IP addresses like : 192.168.0.2 and 192.168.3.4
accessible on the same network ?
( ... that could solve my problem and five me more IP addresses ..... )

Thanks for your help
.

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