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IP Address and IP Ranges Resulting from Supernetting /24 to /23

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just remember when you set this up that you will want to be sure your upstream devices are aware of the new network and mask. Also, you can have multiple /24 subnets or a larger address space with a /23 as you noted. There are advantages and disadvantages to both. By increasing your space, you are going to have more broadcast traffic. Depending on what you are trying to achieve, and the hardware you have, you might find it more efficient to add a second /24 network and vlan. Having discontiguous networks ( and without vlans (or all in a single vlan) is probably not a good idea on a number of levels unless you have some extra hardware to route it all. Too messy. If you can give a little more detail about what you are trying to accomplish and what you have for hardware, we can go from there.