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bind-utils - Utilities for querying DNS name servers.…  more info»


HOST(1)                         BIND9                        HOST(1)

       host - DNS lookup utility

       host [-aCdlnrTwv] [-c class] [-N ndots] [-R number] [-t type]
            [-W wait] [-4] [-6] [ -s ] {name} [server]

       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

       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

       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

       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 behaviour.


       dig(1), named(8).

       Copyright © 2004, 2005, 2007, 2008 Internet Systems
       Consortium, Inc. ("ISC")
       Copyright © 2000-2003 Internet Software Consortium.

BIND9                       Jun 30, 2000                     HOST(1)
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