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IP Calculator 0.41 Enter your netmask(s) in CIDR notation (/25) or dotted decimals (255.255.255.0). Inverse netmask are recognized. If you mmit the netmask, ipcalc uses the default netmask for the class of your network. Look at the space between the bits of the addresses: The bits before it are the network part of the address, the bits after it are the host part. You can see two simple facts: In a network address all host bits are zero, in a broadcast address they are all set. The class of your network is determined by its first bits. If your network is a private internet according to RFC 1918 this is remarked. When displaying subnets the new bits in the network part of the netmask are marked in a different color. The wildcard is the inverse netmask as used for access control lists in Cisco routers. You can also enter netmasks in wildcard notation. Do you want to split your network into subnets? Enter the address and netmask of your original network and play with the second netmask until the result matches your needs. Questions? Comments? Drop me a mail: krischan at jodies.de http://jodies.de/ipcalc Thanks for your nice ideas and help to make this tool more useful: Bartosz Fenski Denis A. Hainsworth Foxfair Hu Frank Quotschalla Hermann J. Beckers Igor Zozulya Kevin Ivory Lars Mueller Lutz Pressler Oliver Seufer Scott Davis Steve Kent Sven Anderson Torgen Foertsch Usage: ipcalc [options] <ADDRESS>[[/]<NETMASK>] [NETMASK] ipcalc takes an IP address and netmask and calculates the resulting broadcast, network, Cisco wildcard mask, and host range. By giving a second netmask, you can design sub- and supernetworks. It is also intended to be a teaching tool and presents the results as easy-to-understand binary values. -n --nocolor Don't display ANSI color codes. -c --color Display ANSI color codes (default). -b --nobinary Suppress the bitwise output. -c --class Just print bit-count-mask of given address. -h --html Display results as HTML (not finished in this version). -v --version Print Version. -s --split n1 n2 n3 Split into networks of size n1, n2, n3. -r --range Deaggregate address range. --help Longer help text. Examples: ipcalc 192.168.0.1/24 ipcalc 192.168.0.1/255.255.128.0 ipcalc 192.168.0.1 255.255.128.0 255.255.192.0 ipcalc 192.168.0.1 0.0.63.255 ipcalc <ADDRESS1> - <ADDRESS2> deaggregate address range ipcalc <ADDRESS>/<NETMASK> --s a b c split network to subnets where a b c fits in. ! New HTML support not yet finished. ipcalc 0.41