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Subnet Calculator

Calculate network details from any IP address and CIDR prefix length

Enter an IP with CIDR prefix (e.g., 192.168.1.100/24) or select prefix below.
Prefix length defines network vs host bits. /24 = 256 addresses, /16 = 65,536.

Network Details

Binary Breakdown

References: RFC 4632 (CIDR), RFC 1918 (Private Addresses), RFC 950 (Subnetting). Common private ranges: 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16.