khost - Simple DNS lookup utility

NAME  SYNOPSIS  DESCRIPTION  Parameters  Options  EXIT VALUES  EXAMPLES  FILES  SEE ALSO  AUTHOR  COPYRIGHT 

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NAME

khost − Simple DNS lookup utility

SYNOPSIS

khost [options] name [server]

DESCRIPTION

This utility sends a DNS query for the name to the server and prints a reply in more user−readable form. For more advanced DNS queries use kdig instead.

Parameters

	name		Is a domain name that is to be looked up. If the name is IPv4 or IPv6 address the PTR query type is used.
	server		Is a name or an address of the nameserver to send a query to. The address can be specified using [address]:port notation. If no server is specified, the servers from /etc/resolv.conf are used.

If no arguments are provided, khost prints a short help.

Options

	−4		Use the IPv4 protocol only.
	−6		Use the IPv6 protocol only.
	−a		Send ANY query with verbose mode.
	−d		Enable debug messages.

−h, −−help

Print the program help.

	−r		Disable recursion.
	−T		Use the TCP protocol.
	−v		Enable verbose output.

−V, −−version

Print the program version.

−w

Wait forever for the reply.

−c class

Set the query class (e.g. CH, CLASS4). The default class is IN.

−t type

Set the query type (e.g. NS, IXFR=12345, TYPE65535). The default is to send 3 queries (A, AAAA and MX).

−R retries

The number (>=0) of UDP retries to query a nameserver. The default is 1.

−W wait

The time to wait for a reply in seconds. This timeout applies to each query try. The default is 2 seconds.

EXIT VALUES

Exit status of 0 means successful operation. Any other exit status indicates an error.

EXAMPLES

1.

Get the A, AAAA and MX records for example.com:

$ khost example.com

2.

Get the reverse record for address 192.0.2.1:

$ khost 192.0.2.1

3.

Perform a verbose zone transfer for zone example.com:

$ khost −t AXFR −v example.com

FILES

/etc/resolv.conf

SEE ALSO

kdig(1), knsupdate(1).

AUTHOR

CZ.NIC Labs <https://www.knot-dns.cz>

COPYRIGHT

Copyright 2010â2024, CZ.NIC, z.s.p.o.

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