Network utility

IPv4 & IPv6 subnet calculator

Enter an address and prefix to calculate its network boundaries and addressing details. You can include the prefix in the address, such as 192.168.10.25/24 or 2001:db8::25/64.

IPv4

IPv4 subnet

Network, broadcast, masks and usable host range.

CIDR notation is accepted directly in the address field.
IPv6

IPv6 prefix

Expanded address, network range and prefix capacity.

Compressed and full IPv6 notation are supported.

Note: Results describe mathematical address ranges. Actual assignability can depend on protocol conventions, platform behavior and network policy.