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Subnet Splitter

Divide one IPv4 network into equal smaller subnets. Each child starts on its own boundary, and the children cover the parent exactly once.

Child CIDR prefix

Child CIDR prefix

8 child blocks

11000000101010000000101000000000
/27
/8/16/24/32
Network bitsHost bits

Drag the line to change how small each child block is.

Subnet mask

255.255.255.0

CIDR /24

Total addresses

256

In 192.168.10.0/24

Child blocks

8

Each is a /27

192.168.10.0/24 divides into 8 /27 blocks.

#SubnetUsable rangeUsable hosts
1192.168.10.0/27192.168.10.1 - 192.168.10.3030
2192.168.10.32/27192.168.10.33 - 192.168.10.6230
3192.168.10.64/27192.168.10.65 - 192.168.10.9430
4192.168.10.96/27192.168.10.97 - 192.168.10.12630
5192.168.10.128/27192.168.10.129 - 192.168.10.15830
6192.168.10.160/27192.168.10.161 - 192.168.10.19030
7192.168.10.192/27192.168.10.193 - 192.168.10.22230
8192.168.10.224/27192.168.10.225 - 192.168.10.25430

How the cut is chosen

The parent is aligned to its own network address first. 192.168.1.50/24 is the block 192.168.1.0/24, then that block is walked in steps of the child size.

A new prefix of /26 has a block size of 64. The four children are 192.168.1.0/26, 192.168.1.64/26, 192.168.1.128/26, and 192.168.1.192/26.

Questions

This splitter cuts a prefix into equal longer prefixes. A /24 split into /26 produces four blocks of 64 addresses. Different sizes belong in the VLSM planner on the subnetting guide.

256 subnets. A /16 split into /24 is the widest cut shown. A wider cut still has a correct count, and you can choose a prefix closer to the parent.

Sources

Reviewed 8 October 2026. The methodology page records what these labels do not cover.

Related tools

All toolsHow the numbers are derived