Subnet calculator

IPv4 and IPv6 prefix arithmetic with a visual split/join plan and YAML/JSON export.

Address with prefix length or netmask

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Visual plan

Split a row in half, or join it back with its sibling. Bar width is the share of 10.20.30.64/27.

Prefix	Range	Hosts
	10.20.30.65 – 10.20.30.94	30

1 block under 10.20.30.64/27

Address00001010.00010100.00011110.01001101

Mask11111111.11111111.11111111.11100000

network bits · host bits