Manual Reference Pages - HOST (1)
- DNS lookup utility
is a simple utility for performing DNS lookups. It is normally
used to convert names to IP addresses and vice versa.
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
will by default perform a reverse lookup for that address.
is not provided,
prints a short summary of its usage.
is an optional argument which is either a domain name or an IP
address of the name server that
should query instead of the server or servers listed in
is a domain name, system resolver is used to obtain its address.
Make a verbose query of type
-v -t ANY.
records for zone
from all of its authoritative name servers. The list of name
servers is obtained via
Perform DNS query of class
Recognized classes are
is a number from 1 to 255). Default is
Produce verbose output. This is a synonym for
and is provided for backward compatibility.
Use IP6.INT domain for reverse lookups of IPv6 addresses (as
defined in RFC1886; note that RFC4159 deprecates IP6.INT).
By default IP6.ARPA is used.
NS, PTR, A
records in zone
by performing a zone transfer
You can combine this option with
to print all records, or with
to only print specific ones.
Consider names with at least this many dots as absolute. That
is, try to resolve them directly before consulting
Perform non-recursive query to the name server by clearing RD
bit of the query.
Retry this many times when a query does not receive an answer
in time. The default is 1 retry. If
is negative or zero, 1 is used instead.
Report SERVFAIL responses as they are, do not ignore them.
Query name server over TCP. By default UDP is used, except for
queries, which require TCP.
will also retry UDP queries in TCP mode if the UDP response was
truncated (i.e. had TC bit set).
Perform DNS query of type
which can be any standard query type name
(A, CNAME, MX, TXT, etc),
a wildcard query
is a number from 1 to 65535. For
IXFR(incremental zone transfer)
queries the starting serial number can be specified by appending
an equal sign followed by the number
(e.g.-t IXFR =12345678).
The default is to query for
A, AAAA, and MX
options are given (in which case
queries are made) or
is a valid IP address
(in which case reverse lookup using
query is performed).
Produce verbose output.
Wait forever (or for a very long time) for response from the
Wait this many seconds for a reply from name server before timing
is negative or zero, value of 1 is used. The default is to wait
10 seconds for TCP connections, and 5 seconds for UDP (both are
subject to retries, see option
Only use IPv4 transport.
Only use IPv6 transport.
aims to be reasonably compatible with
utility from BIND9 distribution, both in supported options and
in produced output. Here is a list of known notable differences:
- Debugging options
(-D and-m )
are not supported.
- Query class
are not supported.
- Backslashes in domain names are treated especially.
- The maximum of 255 retries (option
- Some resource records are formatted differently. For example,
records are displayed without spaces in them.
- When parsing
are ignored. When multiple
commands are present,
first uses the last
command, and then all of
from BIND9 uses whatever command was specified last.
- Multi-packet zone transfers are not supported; only the first
response packet is printed.
is missing from verbose packet output.
.An Vitaly Magerya Aq email@example.com
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