IPv4 Subnet Calculator

This calculator returns a variety of information regarding Internet Protocol version 4 (IPv4) and IPv6 subnets including possible network addresses, usable host ranges, subnet mask, and IP class, among others.

Network Class

Optional: A/B/C class hint. Calculation still uses the selected subnet mask.

Subnet

Pick a subnet mask (dotted & CIDR). Determines network size and host range.

IP Address

Enter a valid IPv4 address (four octets 0–255).