Converters for IPv4 Network and IP address
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Netmask dotted decimal notation to CIDR notation (bits format)
Netmask in CIDR notation to dotted decimal notation
subnet sizes: CIDR mask -- dotted decimal mask -- amount of usable host addresses
Class C subnet calculator (sub-divide a /24 net into smaller nets)
Net planing: Number of required host addresses to netmask
Net planing: Network mask to number of usable host addresses
Dotted decimal IP-address or mask to binary and hex
Hex IP-address or mask to dotted decimal
IP-address bit-complement (inverted IPv4 addr)
Written by Guido Socher, MIT license