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HOST(1)                              BIND9                             HOST(1)



NAME
       host - DNS lookup utility

SYNOPSIS
       host [-aCdlnrsTwv] [-c class] [-N ndots] [-R number] [-t type] [-W wait] [-m flag]
            [-4] [-6] {name} [server]

DESCRIPTION
       host 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, host
       prints a short summary of its command line arguments and options.

       name 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 will by default
       perform a reverse lookup for that address.  server is an optional argument which 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.

       The -a (all) option is equivalent to setting the -v option and asking host to make
       a query of type ANY.

       When the -C option is used, host will 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.

       The -c option instructs to make a DNS query of class class. This can be used to
       lookup Hesiod or Chaosnet class resource records. The default class is IN
       (Internet).

       Verbose output is generated by host when the -d or -v option is used. The two
       options are equivalent. They have been provided for backwards compatibility. In
       previous versions, the -d option switched on debugging traces and -v enabled
       verbose output.

       List mode is selected by the -l option. This makes host perform a zone transfer for
       zone name. Transfer the zone printing out the NS, PTR and address records (A/AAAA).
       If combined with -a all records will be printed.

       The -i option specifies that reverse lookups of IPv6 addresses should use the
       IP6.INT domain as defined in RFC1886. The default is to use IP6.ARPA.

       The -N option sets the number of dots that have to be in name 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
       search or domain directive in /etc/resolv.conf.

       The number of UDP retries for a lookup can be changed with the -R option.  number
       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.

       Non-recursive queries can be made via the -r option. Setting this option clears the
       RD -- recursion desired -- bit in the query which host makes. This should mean that
       the name server receiving the query will not attempt to resolve name. The -r option
       enables host to mimic the behavior 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.

       By default, host uses UDP when making queries. The -T 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.

       The -4 option forces host to only use IPv4 query transport. The -6 option forces
       host to only use IPv6 query transport.

       The -t option is used to select the query type.  type can be any recognized query
       type: CNAME, NS, SOA, SIG, KEY, AXFR, etc. When no query type is specified, host
       automatically selects an appropriate query type. By default, it looks for A, AAAA,
       and MX records, but if the -C option was given, queries will be made for SOA
       records, and if name is a dotted-decimal IPv4 address or colon-delimited IPv6
       address, host will query 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 (e.g. -t IXFR=12345678).

       The time to wait for a reply can be controlled through the -W and -w options. The
       -W option makes host wait for wait seconds. If wait is less than one, the wait
       interval is set to one second. When the -w option is used, host will effectively
       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.

       The -s option tells host not to send the query to the next nameserver if any server
       responds with a SERVFAIL response, which is the reverse of normal stub resolver
       behavior.

       The -m can be used to set the memory usage debugging flags record, usage and trace.

IDN SUPPORT
       If host has been built with IDN (internationalized domain name) support, it can
       accept and display non-ASCII domain names.  host appropriately converts character
       encoding of domain name before sending a request to DNS server or displaying a
       reply from the server. If you'd like to turn off the IDN support for some reason,
       defines the IDN_DISABLE environment variable. The IDN support is disabled if the
       variable is set when host runs.

FILES
       /etc/resolv.conf

SEE ALSO
       dig(1), named(8).

COPYRIGHT
       Copyright (C) 2004, 2005, 2007-2009 Internet Systems Consortium, Inc. ("ISC")
       Copyright (C) 2000-2002 Internet Software Consortium.



BIND9                            Jun 30, 2000                          HOST(1)

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