238 lines
6.3 KiB
Plaintext
238 lines
6.3 KiB
Plaintext
.\" Man page generated from reStructuredText.
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.TH "NSLOOKUP" "1" "@RELEASE_DATE@" "@BIND9_VERSION@" "BIND 9"
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.SH NAME
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nslookup \- query Internet name servers interactively
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.SH SYNOPSIS
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.sp
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\fBnslookup\fP [\-option] [name | \-] [server]
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.SH DESCRIPTION
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.sp
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\fBNslookup\fP is a program to query Internet domain name servers.
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\fBNslookup\fP has two modes: interactive and non\-interactive. Interactive
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mode allows the user to query name servers for information about various
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hosts and domains or to print a list of hosts in a domain.
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Non\-interactive mode is used to print just the name and requested
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information for a host or domain.
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.SH ARGUMENTS
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.sp
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Interactive mode is entered in the following cases:
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.INDENT 0.0
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.IP a. 3
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when no arguments are given (the default name server will be used)
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.IP b. 3
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when the first argument is a hyphen (\-) and the second argument is
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the host name or Internet address of a name server.
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.UNINDENT
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.sp
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Non\-interactive mode is used when the name or Internet address of the
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host to be looked up is given as the first argument. The optional second
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argument specifies the host name or address of a name server.
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.sp
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Options can also be specified on the command line if they precede the
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arguments and are prefixed with a hyphen. For example, to change the
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default query type to host information, and the initial timeout to 10
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seconds, type:
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.INDENT 0.0
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.INDENT 3.5
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.sp
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.nf
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.ft C
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nslookup \-query=hinfo \-timeout=10
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.ft P
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.fi
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.UNINDENT
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.UNINDENT
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.sp
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The \fB\-version\fP option causes \fBnslookup\fP to print the version number
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and immediately exits.
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.SH INTERACTIVE COMMANDS
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.INDENT 0.0
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.TP
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.B \fBhost\fP [server]
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Look up information for host using the current default server or
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using server, if specified. If host is an Internet address and the
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query type is A or PTR, the name of the host is returned. If host is
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a name and does not have a trailing period, the search list is used
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to qualify the name.
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.sp
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To look up a host not in the current domain, append a period to the
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name.
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.TP
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.B \fBserver\fP domain | \fBlserver\fP domain
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Change the default server to domain; \fBlserver\fP uses the initial
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server to look up information about domain, while \fBserver\fP uses the
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current default server. If an authoritative answer can\(aqt be found,
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the names of servers that might have the answer are returned.
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.TP
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.B \fBroot\fP
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not implemented
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.TP
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.B \fBfinger\fP
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not implemented
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.TP
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.B \fBls\fP
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not implemented
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.TP
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.B \fBview\fP
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not implemented
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.TP
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.B \fBhelp\fP
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not implemented
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.TP
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.B \fB?\fP
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not implemented
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.TP
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.B \fBexit\fP
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Exits the program.
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.TP
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.B \fBset\fP keyword[=value]
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This command is used to change state information that affects the
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lookups. Valid keywords are:
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.INDENT 7.0
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.TP
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.B \fBall\fP
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Prints the current values of the frequently used options to
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\fBset\fP\&. Information about the current default server and host is
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also printed.
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.TP
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.B \fBclass=\fPvalue
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Change the query class to one of:
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.INDENT 7.0
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.TP
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.B \fBIN\fP
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the Internet class
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.TP
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.B \fBCH\fP
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the Chaos class
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.TP
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.B \fBHS\fP
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the Hesiod class
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.TP
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.B \fBANY\fP
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wildcard
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.UNINDENT
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.sp
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The class specifies the protocol group of the information.
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.sp
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(Default = IN; abbreviation = cl)
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.TP
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.B \fBnodebug\fP
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Turn on or off the display of the full response packet and any
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intermediate response packets when searching.
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.sp
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(Default = nodebug; abbreviation = [no]deb)
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.TP
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.B \fBnod2\fP
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Turn debugging mode on or off. This displays more about what
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nslookup is doing.
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.sp
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(Default = nod2)
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.TP
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.B \fBdomain=\fPname
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Sets the search list to name.
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.TP
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.B \fBnosearch\fP
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If the lookup request contains at least one period but doesn\(aqt end
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with a trailing period, append the domain names in the domain
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search list to the request until an answer is received.
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.sp
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(Default = search)
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.TP
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.B \fBport=\fPvalue
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Change the default TCP/UDP name server port to value.
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.sp
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(Default = 53; abbreviation = po)
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.TP
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.B \fBquerytype=\fPvalue | \fBtype=\fPvalue
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Change the type of the information query.
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.sp
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(Default = A and then AAAA; abbreviations = q, ty)
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.INDENT 7.0
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.TP
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\fBNote:\fP It is only possible to specify one query type, only the default
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behavior looks up both when an alternative is not specified.
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.UNINDENT
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.TP
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.B \fBnorecurse\fP
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Tell the name server to query other servers if it does not have
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the information.
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.sp
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(Default = recurse; abbreviation = [no]rec)
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.TP
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.B \fBndots=\fPnumber
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Set the number of dots (label separators) in a domain that will
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disable searching. Absolute names always stop searching.
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.TP
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.B \fBretry=\fPnumber
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Set the number of retries to number.
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.TP
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.B \fBtimeout=\fPnumber
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Change the initial timeout interval for waiting for a reply to
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number seconds.
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.TP
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.B \fBnovc\fP
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Always use a virtual circuit when sending requests to the server.
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.sp
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(Default = novc)
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.TP
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.B \fBnofail\fP
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Try the next nameserver if a nameserver responds with SERVFAIL or
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a referral (nofail) or terminate query (fail) on such a response.
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.sp
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(Default = nofail)
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.UNINDENT
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.UNINDENT
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.SH RETURN VALUES
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.sp
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\fBnslookup\fP returns with an exit status of 1 if any query failed, and 0
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otherwise.
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.SH IDN SUPPORT
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.sp
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If \fBnslookup\fP has been built with IDN (internationalized domain name)
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support, it can accept and display non\-ASCII domain names. \fBnslookup\fP
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appropriately converts character encoding of domain name before sending
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a request to DNS server or displaying a reply from the server. If you\(aqd
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like to turn off the IDN support for some reason, define the IDN_DISABLE
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environment variable. The IDN support is disabled if the variable is set
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when \fBnslookup\fP runs or when the standard output is not a tty.
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.SH FILES
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.sp
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\fB/etc/resolv.conf\fP
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.SH SEE ALSO
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.sp
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\fBdig(1)\fP, \fBhost(1)\fP, \fBnamed(8)\fP\&.
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.SH AUTHOR
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Internet Systems Consortium
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.SH COPYRIGHT
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2020, Internet Systems Consortium
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.\" Generated by docutils manpage writer.
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