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IP Subnet Calculator

Calculate network information for IPv4 and IPv6 subnets

IP Version

IP Address

Subnet Mask / CIDR

Enter either subnet mask or CIDR notation

About IP Subnetting

IPv4: Uses 32-bit addresses (e.g., 192.168.1.0). CIDR notation ranges from /0 to /32.

IPv6: Uses 128-bit addresses (e.g., 2001:db8::1). Prefix length ranges from /0 to /128.

CIDR: Classless Inter-Domain Routing notation (e.g., /24) indicates the number of network bits.