🌐 Subnet Calculator
Enter an IPv4 or IPv6 address with CIDR prefix to get the network address, broadcast address, usable host range, total host count, and binary breakdown — instantly.
IPv4 + IPv6
RFC 3021 aware
IPv4 Address + CIDR
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/31 subnets follow RFC 3021 (point-to-point links — both addresses usable, no broadcast). /32 and IPv6 /128 are single-host addresses.