Subnetting is the practice of dividing a network into two or more smaller networks. It increases routing efficiency, enhances security, and reduces network congestion.
Our calculator supports RFC 3021 for /31 subnets, which are commonly used for point-to-point links. In a /31 subnet, both addresses are usable for host assignments.
IPv6 uses 128-bit addresses, allowing for 340 undecillion unique addresses. Every /64 subnet contains 18 quintillion addresses—more than all of IPv4.