ipcalc

If you sometimes find yourself scratching your head when dealing with IPv4 networks, then ipcalc might just be the tool for you. Ipcalc is a simple rewrite of its homonym written in perl ipcalc. The main differences are that this ipcalc is written in C, and supports "BSD style" netmasks written in hexadecimal notation.

features

Some interesting features of ipcalc (see manpage for more detail):

• netmask conversions between formats
• network splitting
• network finding
• no compile-time warnings, even with aggressive options

manpage

ipcalc(1)

examples

(panda@phoenix) panda$ipcalc 10.0.0.1/24 
address   : 10.0.0.1        
netmask   : 255.255.255.0   (0xffffff00)
network   : 10.0.0.0        /24
broadcast : 10.0.0.255      
host min  : 10.0.0.1        
host max  : 10.0.0.254      
hosts/net : 254

(panda@phoenix) panda$ipcalc -vs 12,4 10.0.0.0/24
you want a /28 to store 12 IPs
address   : 10.0.0.0        
netmask   : 255.255.255.240 (0xfffffff0)
network   : 10.0.0.0        /28
broadcast : 10.0.0.15       
host min  : 10.0.0.1        
host max  : 10.0.0.14       
hosts/net : 14

you want a /29 to store 4 IPs
address   : 10.0.0.16       
netmask   : 255.255.255.248 (0xfffffff8)
network   : 10.0.0.16       /29
broadcast : 10.0.0.23       
host min  : 10.0.0.17       
host max  : 10.0.0.22       
hosts/net : 6

remaining:
10.0.0.24/29
10.0.0.32/27
10.0.0.64/26
10.0.0.128/25

download

The latest release is ipcalc 1.3
Ipcalc is now in the OpenBSD ports tree.

author

ipcalc was written by Pierre-Yves Ritschard <pyr@spootnik.org>