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host(1M)		System Administration Commands		      host(1M)

NAME
       host - DNS lookup utility

SYNOPSIS
       host [-aCdilmrsTvw] [-c class] [-N ndots] [-R number]
	    [-t type] [-W wait]	 [-4 | -6] name [server]

DESCRIPTION
       The  host  utility  performs simple DNS lookups. It is normally used to
       convert names to IP addresses and IP addresses to names. When no	 argu‐
       ments  or options are given, host prints a short summary of its command
       line arguments and options.

       The name argument 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 host by default performs a  reverse  lookup  for
       that  address.  The  optional  server argument is either the name or IP
       address of the name server that host should query instead of the server
       or servers listed in /etc/resolv.conf.

OPTIONS
       The following options are supported:

       -4

	   Use	only IPv4 transport. By default, both IPv4 and IPv6 transports
	   can be used. Options -4 and -6 are mutually exclusive.

       -6

	   Use only IPv6 transport. By default, both IPv4 and IPv6  transports
	   can be used. Options -4 and -6 are mutually exclusive.

       -a

	   Equivalent to setting the -v option and asking host to make a query
	   of type ANY.

       -c class

	   Make a DNS query of class class. This can be used to lookup	Hesiod
	   or Chaosnet class resource records. The default class is IN (Inter‐
	   net).

       -C

	   Attempt to display the SOA records  for  zone  name	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.

       -d

	   Generate verbose output. This option is equivalent to -v. These two
	   options  are	 provided for backward compatibility. In previous ver‐
	   sions, the -d option switched on debugging traces  and  -v  enabled
	   verbose output.

       -i

	   Specifies  that  reverse  lookups  of IPv6 addresses should use the
	   IP6.INT domain as defined in RFC 1886. The default is  to  use  RFC
	   3152 domain IP6.ARPA.

       -l

	   List	 mode. This option makes host perform a zone transfer for zone
	   name, displaying the NS, PTR and address records (A/AAAA). If  com‐
	   bined  with -a, all records will be displayed. The argument is pro‐
	   vided for compatibility with previous implementations. Options  -la
	   is equivalent to making a query of type AXFR.

       -m

	   Sets the memory usage debugging flags: record, usage, and trace.

       -N ndots

	   Set the number of dots that have to be in name for it to be consid‐
	   ered 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 search or
	   domain directive in /etc/resolv.conf.

       -r

	   Make a non-recursive query.	Setting	 this  option  clears  the  RD
	   (recursion  desired) bit in the query made by host. The name server
	   receiving the query does not attempt to resolve name. The -r option
	   enables host to mimic the behaviour of a name server by making non-
	   recursive queries and expecting to receive answers to those queries
	   that are usually referrals to other name servers.

       -R number

	   Change  the number of UDP retries for a lookup. The number argument
	   indicates how many times host will repeat a query that does not get
	   answered. The default number of retries is 1. If number is negative
	   or zero, the number of retries will default to 1.

       -s

	   Specifies that the host not send the query to the next name	server
	   if  any  server  responds  with  a  SERVFAIL response, which is the
	   reverse of normal stub resolver behavior.

       -t type

	   Select the query type. The type  argument  can  be  any  recognised
	   query  type: CNAME, NS, SOA, SIG, KEY, and AXFR, among others. When
	   no query type is specified, host automatically selects an appropri‐
	   ate	query  type.  By default it looks for A, AAAA, and MX records,
	   but if the -C  option  is  specified,  queries  are	made  for  SOA
	   records.  If	 name is a dotted-decimal IPv4 address or colon-delim‐
	   ited IPv6 address, host queries for PTR records.

	   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 (for example: -t IXFR=12345678).

       -T

	   Use a TCP connection when querying the name server. TCP is automat‐
	   ically  selected for queries that require it, such as zone transfer
	   (AXFR) requests. By default host uses UDP when making queries.

       -v

	   Generate verbose output. This option is equivalent to -d.

       -w

	   Wait forever for a reply. The time to wait for a response  will  be
	   set	to the number of seconds given by the hardware's maximum value
	   for an integer quantity.

       -W wait

	   Wait for wait seconds for a reply.  If wait is less than  one,  the
	   wait interval is set to one second.

FILES
       /etc/resolv.conf

	   Resolver configuration file

ATTRIBUTES
       See for descriptions of the following attributes:

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Availability		     │network/dns/bind		   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Interface Stability	     │Volatile			   │
       └─────────────────────────────┴─────────────────────────────┘

SEE ALSO
       dig(1M), named(1M), attributes(5)

       RFC 1035, RFC 1886, RFC 3152

       See the BIND 9 Administrator's Reference Manual. As of the date of pub‐
       lication	 of  this  man	 page,	 this	document   is	available   at
       https://www.isc.org/software/bind/documentation.

SunOS 5.10			  11 Jan 2010			      host(1M)
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