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CIDR Split Calculator

Split a CIDR block into equal subnets by count or prefix length.

Examples:

Enter a CIDR block and split size to divide it

Related Tools

Subnet Calculator

Enter any IPv4 address and CIDR prefix or dotted subnet mask like 255.255.255.0. Network address, broadcast, host range, and wildcard mask calculate instantly. The built-in visual subnet calculator lets you split and rejoin blocks interactively.

CIDR Merge

Paste a list of IPv4 or IPv6 CIDR blocks and merge overlapping or adjacent ranges into the smallest possible set of non-overlapping prefixes.

CIDR to IP Range

Convert a CIDR block to its first and last IP, or find the smallest CIDR that covers two IP addresses.

About this tool

CIDR Split divides an IP address block into equal-sized subnets. Use split by prefix to specify the desired subnet size (e.g. split 10.0.0.0/16 into /24s for 256 subnets), or split by count to let the calculator choose the prefix that produces at least that many subnets. Each subnet row shows its network address, broadcast address, usable host range, and host count. For splits larger than 256 subnets, download the full list as a text file.