Subnet Calculator
CIDR / subnet mask conversion, address ranges, and subnet splitting for IPv4 and IPv6.
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I forgot too much stuff! So, created this site!
I forgot too much stuff! So, created this site!
CIDR / subnet mask conversion, address ranges, and subnet splitting for IPv4 and IPv6.
Blue = network bits, gray = host bits.
Fill in either the subnet count (rounded up to a power of 2) or a specific new prefix length.
Subnets are allocated largest-first from the base network to minimize wasted space.
Results are capped at 500 rows for display; the total subnet count is always shown.
