VLSM Subnet Planner

Parent block

Subnets needed One subnet per line: an optional name, then the number of usable hosts it needs.

Use /31 for 2-host point-to-point links (RFC 3021)

Name	Hosts	Subnet	Mask	Usable range	Broadcast	Spare

Subnets are allocated largest first, so each one starts on its natural boundary and there are no gaps between them.