host [-aCdlnrTwv] [-c class] [-N ndots] [-R number] [-t type]
[-W wait] [-4] [-6] {name} [server]
| -a |
(all) option is equivalent to
setting the -v option and asking host to make a query of
type ANY. |
| -C |
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 |
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). |
| -d, -v |
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. |
| -l |
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. |
| -i |
Specifies that reverse lookups
of IPv6 addresses should use the IP6.INT domain as defined
in RFC1886. The default is to use IP6.ARPA. |
| -N |
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. |
| -R |
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. |
| -r |
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 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 |
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. |
| -4, -6 |
The -4 option forces host to
only use IPv4 query transport. The -6 option forces host to
only use IPv6 query transport. |
| -t |
The -t 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 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). |
| -W, -w |
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. |
3.150.228.204.in-addr.arpa domain name pointer
www.computerhope.com.
