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Network tool

Subnet splitter

Split an IPv4 or IPv6 CIDR network into smaller child networks. Output is limited to the first 256 child networks.

What this tool does

Subnet splitter divides one CIDR network into smaller child networks with a longer prefix length.

Use it when you need to allocate a larger network into smaller ranges for teams, environments, routers, firewall rules, or documentation. Output is capped at 256 child networks so very large splits stay fast.

CIDR notation explained Review prefix lengths before splitting a network. CIDR calculator Check the parent network details before splitting. Range to CIDR Convert arbitrary start/end ranges into CIDR blocks. IP in CIDR Verify which child network contains a specific address.