dig.1m (2010 09)

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dig(1M) dig(1M)

(BIND 9.3)

NAME

dig - domain information groper

SYNOPSIS

Single Query

dig [@server][-4

|-6][-b address[#port]] [-c class ][

-f ﬁlename ][-i][-k ﬁlename ][

-p port ]

[

-t type ][-x

addr][-y name:key][name][type ][class ][queryopt ]...

Help

dig -h

Multiple Query

dig [global-queryopt]... [query ]...

DESCRIPTION

dig, the domain information groper, is a ﬂexible tool for interrogating Domain Name System (DNS)

servers. It performs DNS lookups and displays the answers that are returned from the name servers that

were queried. Most DNS administrators use

dig to troubleshoot DNS problems because of its ﬂexibility,

ease of use, and clarity of output. The

dig command has two modes: a simple command-line mode for

single or multiple queries and a batch mode for reading lookup requests from a ﬁle (

-f option).

Unless it is told to query a speciﬁc name server (

@server option), dig

tries each of the servers listed in

/etc/resolv.conf.

When no command line arguments or options are given, dig performs an NS query for . (the root).

A simple, typical invocation of

dig looks like:

dig @server name type

Options

Options can be speciﬁed in any order.

@server Use server as the name server to query. server can be a host name, an IPv4 address in dotted-

decimal notation, or an IPv6 address in colon-delimited notation. When server is a host name,

dig resolves that name before querying that name server. If @server is omitted, dig queries

the name servers listed in /etc/resolv.conf

. The reply from the name server that

responds is displayed.

-4 Use the IPv4 query transport only.

-6 Use the IPv6 query transport only.

-b address[#port]

Set the source IP address of the query to address . This must be a valid address on one of the

host’s network interfaces or 0.0.0.0 or ::. An optional port on the source may be speciﬁed

by appending #port.

-c class Set the query class. The default is IN, for Internet. class can also be HS, for Hesiod records,

or CH, for Chaosnet records.

-f filename

Make dig operate in batch mode by reading a list of lookup requests to process from the ﬁle

ﬁlename . The ﬁle contains a number of queries, one per line. Each entry in the ﬁle should be

organized in the same way it would be presented as a query to dig using the command-line

interface.

-h Display the annotated syntax for the command. If other options or operands are speciﬁed,

they are ignored.

-i Look up IPv6 addresses using the older IP6.INT domain, described in RFC 1886. See the -x

option.

-k filename

Specify a TSIG key ﬁle in order to sign the DNS queries sent by dig and their responses using

transaction signatures (TSIG).

HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1

Summary of content (6 pages)

PAGE 1
dig(1M) dig(1M) (BIND 9.3) NAME dig - domain information groper SYNOPSIS Single Query dig [@server] [-4|-6] [-b address[#port] ] [-c class ] [-f filename ] [-i] [-k filename ] [-p port ] [-t type ] [-x addr ] [-y name :key] [name] [type ] [class ] [queryopt ]... Help dig -h Multiple Query dig [global-queryopt]... [query ]... DESCRIPTION dig, the domain information groper, is a flexible tool for interrogating Domain Name System (DNS) servers.
PAGE 2
dig(1M) dig(1M) (BIND 9.3) -p port Send queries to a port number, port , instead of to the standard DNS port number 53. Use this option to test a name server that has been configured to listen for queries on a nonstandard port number. -t type Set the query type to type . It can be any valid query type which is supported in BIND 9. For potential values, see the set querytype command in nslookup (1) and the Zone File discussion in named.conf (4).
PAGE 3
dig(1M) dig(1M) (BIND 9.3) +[no]additional Display [do not display] the additional section of a reply. The default is +additional. +[no]adflag Set [do not set] the AD (authenticate data) bit in the query. The AD bit currently has a standard meaning only in responses and not in queries. The ability to set the bit in the query is provided for completeness. The default is +noadflag. +[no]all Set [clear] all display flags. The default is +all.
PAGE 4
dig(1M) dig(1M) (BIND 9.3) +[no]nssearch Attempt [do not attempt] to find the authoritative name servers for the zone containing the name being looked up and display the SOA record that each name server has for the zone. +nssearch also sets the +norecurse query option. The default is +nonssearch, +[no]qr Print [do not print] the query before actually sending the query. The default is +noqr. +[no]question Print [do not print] the question section of a query when an answer is returned.
PAGE 5
dig(1M) dig(1M) (BIND 9.3) EXAMPLES Example 1 To look up information about domain a.example.com using DNS-Server 10.53.0.2 asking for host address A records: $ dig +tcp +noadd +nosea +nostat +noquest +nocmd -p 5300 \ a.example.com @10.53.0.2 a Example 2 To query a.example.com using DNS-Server 10.53.0.2 without authentication, asking for A records: $ dig +tcp +noadd +nosea +nostat +noquest +nocmd +noauth \ -p 5300 a.example.com @10.53.0.
PAGE 6
(Notes) A (Notes) dA 6 Hewlett-Packard Company −1− HP-UX 11i Version 3: September 2010