[/prefix] [netmask]
DESCRIPTION
ipcalc provides a simple way to calculate IP information for a host.
The various options specify what information ipcalc should display on
standard out. Multiple options may be specified. An IP address to
operate on must always be specified. Most operations also require a
netmask or a CIDR prefix as well.
OPTIONS
-c, check
Validate the IP address under the specified family. If
no address family is specified, IPv4 is assumed.
-4, ipv4
Specify IPv4 address family (default).
-6, ipv6
Specify IPv6 address family.
-b, broadcast
Display the broadcast address for the given IP address
and netmask.
-h, hostname
Display the hostname for the given IP address.
-m, netmask
Calculate the netmask for the given IP address. It
assumes that the IP address is in a complete class A, B,
or C network. Many networks do not use the default net‐
masks, in which case an inappropriate value will be
returned.
-p, prefix
Show the prefix for the given mask/IP address.
-n, network
Display the network address for the given IP address and
netmask.
-s, silent
Don't ever display error messages.
AUTHORS
Erik Troan
Preston Brown
IPv6 supported wedged in by David Cantrell
REPORTING BUGS
Report bugs at http://bugzilla.redhat.com/
COPYRIGHT
Copyright © 1997-2008 Red Hat, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE.
Red Hat, Inc. April 30 2001 IPCALC(1)