// Tool
Subnet Splitter
Enter a parent CIDR and choose how to split it. All subnets appear in a compact scrollable table — no clicking to expand.
Frequently Asked Questions
What is VLSM (Variable Length Subnet Masking)?
VLSM is the practice of using different prefix lengths within the same network so each subnet is sized to its host count, avoiding the waste of fixed-size subnetting. This tool lists every resulting subnet when you split a block.
How many subnets do I get splitting a /24 into /26s?
Four. Each additional prefix bit doubles the subnet count — a
/24 to /26 is two bits, so 2^2 = 4 subnets of 62 usable hosts each.What is the smallest subnet I can use?
For normal host subnets,
/30 (2 usable hosts) is the practical minimum. /31 (RFC 3021) is used for point-to-point links — 2 hosts and no broadcast — and /32 represents a single host.Can I split by hosts per subnet instead of by count?
Yes. Choose by number of subnets, by target prefix length, or by minimum hosts per subnet, and the tool computes the right prefix and lists every subnet with its range, broadcast, and wildcard mask.
