🌐 IP Subnet Calculator
Enter an IP address with CIDR notation to calculate subnet details.
Common Subnets
CIDR Notation
CIDR (Classless Inter-Domain Routing) notation combines an IP address with a prefix length (e.g. /24). The prefix length indicates how many bits are used for the network portion.
A /24 subnet has 256 addresses (254 usable hosts), a /16 has 65,536, and a /8 has 16,777,216.