Subnet Splitting Examples | /24 to /25 and /26
Follow practical subnetting examples such as /24 to /25, /24 to /26, and /18 to /24.
Why split a subnet1
Keeping one large segment often makes the broadcast domain too wide and makes it harder to separate roles cleanly. Subnetting lets you cut one larger CIDR into smaller units that are easier to operate.
Example: split /24 into /252
If you split 192.168.0.0/24 into /25 networks, you get these two subnets.
192.168.0.0/25range: 192.168.0.0 - 192.168.0.127192.168.0.128/25range: 192.168.0.128 - 192.168.0.255
The broadcast addresses are 192.168.0.127 and 192.168.0.255.
Example: split /24 into /263
If you split 192.168.0.0/24 into /26 networks, you get four subnets.
192.168.0.0/26broadcast:192.168.0.63192.168.0.64/26broadcast:192.168.0.127192.168.0.128/26broadcast:192.168.0.191192.168.0.192/26broadcast:192.168.0.255
How to think about /18 to /244
The broadcast address of 192.168.0.0/18 is 192.168.63.255. That means 192.168.0.255 is usable as a host address inside the larger /18.
Once that /18 is split into /24 networks, 192.168.0.255 becomes the broadcast address of 192.168.0.0/24 again. Reserved addresses depend on the subnet size you actually operate.