IP Subnet Calculator

Calculate IPv4 and IPv6 Subnets

This tool returns a variety of information regarding IP subnets—including possible network addresses, usable host ranges, subnet mask, and IP class.

IPv4 Subnet Calculator

IPv6 Subnet Calculator

About Subnets

A subnet is a division of an IP network (internet protocol suite), where the network is split into smaller subnetworks for efficient routing and improved security. IPv4 uses subnet masks to separate the network and host portions, while IPv6 uses a prefix length.