Calculate network address, broadcast address, subnet mask, and usable IP range. Supports IPv4, IPv6, and subnet division.
Format: IP address / prefix length (e.g. 192.168.1.0/24)
CIDR notation — Classless Inter-Domain Routing.
Prefix length — Number of bits used for the network portion.
• /8 = 255.0.0.0 (Class A default)
• /16 = 255.255.0.0 (Class B default)
• /24 = 255.255.255.0 (Class C default)
• /30 = 255.255.255.252 (point-to-point)
Special addresses：
• Network address — cannot be assigned to a host.
• Broadcast address — used for broadcasts.
• Usable IPs = total − 2 (network + broadcast).