The Ultimate Subnet Calculator

IPv4 with CIDR: 192.168.1.100 and /24
IPv4 with Netmask: 10.0.0.5 and 255.0.0.0
IPv6 with CIDR: 2001:db8:: and /64

A fast, accurate, and mobile-friendly tool for networking professionals. Easily calculate IPv4 and IPv6 subnets, wildcards, and host ranges.