|HOST(1)||General Commands Manual||HOST(1)|
host — DNS lookup
host command is a simple utility for
performing DNS lookups. It is normally used to convert names to IP addresses
and vice versa.
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
host should query instead of the server or
servers listed in /etc/resolv.conf.
The options are as follows:
-aoption is normally equivalent to
ANY. It also affects the behaviour of the
-llist zone option.
hostwill query 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.
CH(Chaosnet) class resource records. The default class is
hostcommand performs a zone transfer of zone name and prints out the NS, PTR and address records (A/AAAA).
-a options print all records in the zone.
trace. You can specify the
-moption more than once to set multiple flags.
hostto mimic the behavior of a name server by making non-recursive queries and expecting to receive answers to those queries that can be referrals to other name servers.
hostuses UDP when making queries. The
-Toption 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.
When no query type is specified,
automatically selects an appropriate query type. By default, it looks
for A, AAAA, and MX records. If the
-C option is
given, queries will be made for SOA records. 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 (like
host will wait for 5
seconds for UDP responses and 10 seconds for TCP connections.
Internet Systems Consortium, Inc.
|December 24, 2019||OpenBSD-current|