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 host(1)                                                             host(1)

 NAME    [Toc]    [Back]
      host - DNS lookup utility

 SYNOPSIS    [Toc]    [Back]
      host [-aCdlnrTwv] [-c class] [-N ndots] [-R number] [-t type]
           [-W wait] name server

 DESCRIPTION    [Toc]    [Back]
      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.

    Arguments    [Toc]    [Back]
           name      This is the domain name that is to be looked up.  It
                     can also be a dotted-decimal IPv4 address or a colondelimited
 IPv6 address, in which case host will by
                     default perform a reverse lookup for that address.

           server    This 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

    Options    [Toc]    [Back]
           a         This option is equivalent to setting the v option and
                     asking host to make a query of type ANY.

           C         When this 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.

           c class   This option instructs host 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, for

           d  v      Verbose output is generated by host when one of these
                     options are 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.

           l         List mode is selected by this option.  This makes host
                     perform a zone transfer for zone name.  The argument is
                     provided for compatibility with older
                     implemementations.  This option is equivalent to making
                     a query of type AXFR.

 Hewlett-Packard Company            - 1 -   HP-UX 11i Version 2: August 2003

 host(1)                                                             host(1)

           n         This option specifies that reverse lookups of IPv6
                     addresses should use the IP6.INT domain and "nibble"
                     labels as defined in RFC1886.  The default is to use
                     IP6.ARPA and binary labels as defined in RFC2874.

           N ndots   This option sets the number of dots that have to be in
                     name for it to be considered absolute.  The default
                     value is 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

           R number  The number of UDP retries for a lookup can be changed
                     with this 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.

           r         Non-recursive queries can be made via this 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.

                     This 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.

           T         This option makes host to 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.  By default host uses UDP
                     when making queries.

           t type    This option is used to select the query type.  type can
                     be any recognised 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 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 colondelimited
 IPv6 address, host will query for PTR

           W wait    The time to wait for a reply can be controlled through
                     the W option.  This option makes host wait for wait
                     seconds.  If wait is less than 1, the wait interval is
                     set to one second.

 Hewlett-Packard Company            - 2 -   HP-UX 11i Version 2: August 2003

 host(1)                                                             host(1)

           w         When this 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.

 FILES    [Toc]    [Back]

 SEE ALSO    [Toc]    [Back]
      named(1M), resolver(4).

 Hewlett-Packard Company            - 3 -   HP-UX 11i Version 2: August 2003
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