fdnsnamep(1) General Commands Manual fdnsnamep(1)NAME
fdnsnamep - resolve an IPv4 or IPv6 address to a hostname with paranoid checking
SYNOPSIS
fdnsname <IP address>
DESCRIPTION
fdnsname will attempt to look up a single hostname for IP address (which is an IPv4 address in dotted-quad format or an IPv6 address in
colon-seperated format). If one is found, the program checks to make sure that the hostname has a corresponding A or AAAA record pointing
back to the supplied IP. If so, the hostname is printed to standard output and the program exits with return code 0. If the paranoid
check fails, nothing is printed and the program exits with return code 3. If no hostname is found, nothing is printed and the program
exits with return code 1.
AUTHOR
Ian Gulliver <ian@penguinhosting.net>
SEE ALSO libfiredns(3)
2004-02-13 fdnsnamep(1)
Check Out this Related Man Page
IPCALC(1) General Commands Manual IPCALC(1)NAME
ipcalc - perform simple manipulation of IP addresses
SYNOPSIS
ipcalc [OPTION]... <IP address>[/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 net-
works do not use the default netmasks, 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 <ewt@redhat.com>
Preston Brown <pbrown@redhat.com>
IPv6 supported wedged in by David Cantrell <dcantrell@redhat.com>
REPORTING BUGS
Report bugs at http://bugzilla.redhat.com/
COPYRIGHT
Copyright (C) 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 PARTICU-
LAR PURPOSE.
Red Hat, Inc. April 30 2001 IPCALC(1)
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