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+.\" Copyright (C) 2000-2002, 2004, 2005, 2007-2009, 2014-2019 Internet Systems Consortium, Inc. ("ISC")
+.\" 
+.\" This Source Code Form is subject to the terms of the Mozilla Public
+.\" License, v. 2.0. If a copy of the MPL was not distributed with this
+.\" file, You can obtain one at http://mozilla.org/MPL/2.0/.
+.\"
+.hy 0
+.ad l
+'\" t
+.\"     Title: host
+.\"    Author: 
+.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
+.\"      Date: 2009-01-20
+.\"    Manual: BIND9
+.\"    Source: ISC
+.\"  Language: English
+.\"
+.TH "HOST" "1" "2009\-01\-20" "ISC" "BIND9"
+.\" -----------------------------------------------------------------
+.\" * Define some portability stuff
+.\" -----------------------------------------------------------------
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.\" http://bugs.debian.org/507673
+.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.ie \n(.g .ds Aq \(aq
+.el       .ds Aq '
+.\" -----------------------------------------------------------------
+.\" * set default formatting
+.\" -----------------------------------------------------------------
+.\" disable hyphenation
+.nh
+.\" disable justification (adjust text to left margin only)
+.ad l
+.\" -----------------------------------------------------------------
+.\" * MAIN CONTENT STARTS HERE *
+.\" -----------------------------------------------------------------
+.SH "NAME"
+host \- DNS lookup utility
+.SH "SYNOPSIS"
+.HP \w'\fBhost\fR\ 'u
+\fBhost\fR [\fB\-aCdlnrsTUwv\fR] [\fB\-c\ \fR\fB\fIclass\fR\fR] [\fB\-N\ \fR\fB\fIndots\fR\fR] [\fB\-R\ \fR\fB\fInumber\fR\fR] [\fB\-t\ \fR\fB\fItype\fR\fR] [\fB\-W\ \fR\fB\fIwait\fR\fR] [\fB\-m\ \fR\fB\fIflag\fR\fR] [[\fB\-4\fR] | [\fB\-6\fR]] [\fB\-v\fR] [\fB\-V\fR] {name} [server]
+.SH "DESCRIPTION"
+.PP
+\fBhost\fR
+is a simple utility for performing DNS lookups\&. It is normally used to convert names to IP addresses and vice versa\&. When no arguments or options are given,
+\fBhost\fR
+prints a short summary of its command line arguments and options\&.
+.PP
+\fIname\fR
+is the domain name that is to be looked up\&. It can also be a dotted\-decimal IPv4 address or a colon\-delimited IPv6 address, in which case
+\fBhost\fR
+will by default perform a reverse lookup for that address\&.
+\fIserver\fR
+is an optional argument which is either the name or IP address of the name server that
+\fBhost\fR
+should query instead of the server or servers listed in
+/etc/resolv\&.conf\&.
+.SH "OPTIONS"
+.PP
+\-4
+.RS 4
+Use IPv4 only for query transport\&. See also the
+\fB\-6\fR
+option\&.
+.RE
+.PP
+\-6
+.RS 4
+Use IPv6 only for query transport\&. See also the
+\fB\-4\fR
+option\&.
+.RE
+.PP
+\-a
+.RS 4
+"All"\&. The
+\fB\-a\fR
+option is normally equivalent to
+\fB\-v \-t \fR\fBANY\fR\&. It also affects the behaviour of the
+\fB\-l\fR
+list zone option\&.
+.RE
+.PP
+\-c \fIclass\fR
+.RS 4
+Query class: This can be used to lookup HS (Hesiod) or CH (Chaosnet) class resource records\&. The default class is IN (Internet)\&.
+.RE
+.PP
+\-C
+.RS 4
+Check consistency:
+\fBhost\fR
+will query the SOA records for zone
+\fIname\fR
+from all the listed authoritative name servers for that zone\&. The list of name servers is defined by the NS records that are found for the zone\&.
+.RE
+.PP
+\-d
+.RS 4
+Print debugging traces\&. Equivalent to the
+\fB\-v\fR
+verbose option\&.
+.RE
+.PP
+\-i
+.RS 4
+Obsolete\&. Use the IP6\&.INT domain for reverse lookups of IPv6 addresses as defined in RFC1886 and deprecated in RFC4159\&. The default is to use IP6\&.ARPA as specified in RFC3596\&.
+.RE
+.PP
+\-l
+.RS 4
+List zone: The
+\fBhost\fR
+command performs a zone transfer of zone
+\fIname\fR
+and prints out the NS, PTR and address records (A/AAAA)\&.
+.sp
+Together, the
+\fB\-l \-a\fR
+options print all records in the zone\&.
+.RE
+.PP
+\-N \fIndots\fR
+.RS 4
+The number of dots that have to be in
+\fIname\fR
+for it to be considered absolute\&. The default value is that defined using the ndots statement in
+/etc/resolv\&.conf, or 1 if no ndots statement is present\&. Names with fewer dots are interpreted as relative names and will be searched for in the domains listed in the
+\fBsearch\fR
+or
+\fBdomain\fR
+directive in
+/etc/resolv\&.conf\&.
+.RE
+.PP
+\-r
+.RS 4
+Non\-recursive query: Setting this option clears the RD (recursion desired) bit in the query\&. This should mean that the name server receiving the query will not attempt to resolve
+\fIname\fR\&. The
+\fB\-r\fR
+option enables
+\fBhost\fR
+to mimic the behavior of a name server by making non\-recursive queries and expecting to receive answers to those queries that can be referrals to other name servers\&.
+.RE
+.PP
+\-R \fInumber\fR
+.RS 4
+Number of retries for UDP queries: If
+\fInumber\fR
+is negative or zero, the number of retries will default to 1\&. The default value is 1, or the value of the
+\fIattempts\fR
+option in
+/etc/resolv\&.conf, if set\&.
+.RE
+.PP
+\-s
+.RS 4
+Do
+\fInot\fR
+send the query to the next nameserver if any server responds with a SERVFAIL response, which is the reverse of normal stub resolver behavior\&.
+.RE
+.PP
+\-t \fItype\fR
+.RS 4
+Query type: The
+\fItype\fR
+argument can be any recognized query type: CNAME, NS, SOA, TXT, DNSKEY, AXFR, etc\&.
+.sp
+When no query type is specified,
+\fBhost\fR
+automatically selects an appropriate query type\&. By default, it looks for A, AAAA, and MX records\&. If the
+\fB\-C\fR
+option is given, queries will be made for SOA records\&. If
+\fIname\fR
+is a dotted\-decimal IPv4 address or colon\-delimited IPv6 address,
+\fBhost\fR
+will query for PTR records\&.
+.sp
+If a query type of IXFR is chosen the starting serial number can be specified by appending an equal followed by the starting serial number (like
+\fB\-t \fR\fBIXFR=12345678\fR)\&.
+.RE
+.PP
+\-T, \-U
+.RS 4
+TCP/UDP: By default,
+\fBhost\fR
+uses UDP when making queries\&. The
+\fB\-T\fR
+option makes it use a TCP connection when querying the name server\&. TCP will be automatically selected for queries that require it, such as zone transfer (AXFR) requests\&. Type ANY queries default to TCP but can be forced to UDP initially using
+\fB\-U\fR\&.
+.RE
+.PP
+\-m \fIflag\fR
+.RS 4
+Memory usage debugging: the flag can be
+\fIrecord\fR,
+\fIusage\fR, or
+\fItrace\fR\&. You can specify the
+\fB\-m\fR
+option more than once to set multiple flags\&.
+.RE
+.PP
+\-v
+.RS 4
+Verbose output\&. Equivalent to the
+\fB\-d\fR
+debug option\&. Verbose output can also be enabled by setting the
+\fIdebug\fR
+option in
+/etc/resolv\&.conf\&.
+.RE
+.PP
+\-V
+.RS 4
+Print the version number and exit\&.
+.RE
+.PP
+\-w
+.RS 4
+Wait forever: The query timeout is set to the maximum possible\&. See also the
+\fB\-W\fR
+option\&.
+.RE
+.PP
+\-W \fIwait\fR
+.RS 4
+Timeout: Wait for up to
+\fIwait\fR
+seconds for a reply\&. If
+\fIwait\fR
+is less than one, the wait interval is set to one second\&.
+.sp
+By default,
+\fBhost\fR
+will wait for 5 seconds for UDP responses and 10 seconds for TCP connections\&. These defaults can be overridden by the
+\fItimeout\fR
+option in
+/etc/resolv\&.conf\&.
+.sp
+See also the
+\fB\-w\fR
+option\&.
+.RE
+.SH "IDN SUPPORT"
+.PP
+If
+\fBhost\fR
+has been built with IDN (internationalized domain name) support, it can accept and display non\-ASCII domain names\&.
+\fBhost\fR
+appropriately converts character encoding of domain name before sending a request to DNS server or displaying a reply from the server\&. If you\*(Aqd like to turn off the IDN support for some reason, defines the
+\fBIDN_DISABLE\fR
+environment variable\&. The IDN support is disabled if the variable is set when
+\fBhost\fR
+runs\&.
+.SH "FILES"
+.PP
+/etc/resolv\&.conf
+.SH "SEE ALSO"
+.PP
+\fBdig\fR(1),
+\fBnamed\fR(8)\&.
+.SH "AUTHOR"
+.PP
+\fBInternet Systems Consortium, Inc\&.\fR
+.SH "COPYRIGHT"
+.br
+Copyright \(co 2000-2002, 2004, 2005, 2007-2009, 2014-2019 Internet Systems Consortium, Inc. ("ISC")
+.br