1NSLOOKUP(1) BIND9 NSLOOKUP(1)
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6 nslookup - query Internet name servers interactively
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9 nslookup [-option] [name | -] [server]
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12 Nslookup is a program to query Internet domain name servers. Nslookup
13 has two modes: interactive and non-interactive. Interactive mode allows
14 the user to query name servers for information about various hosts and
15 domains or to print a list of hosts in a domain. Non-interactive mode
16 is used to print just the name and requested information for a host or
17 domain.
18
20 Interactive mode is entered in the following cases:
21 1. when no arguments are given (the default name server will be used)
23 2. when the first argument is a hyphen (-) and the second argument is
25 the host name or Internet address of a name server.
26 Non-interactive mode is used when the name or Internet address of the
28 host to be looked up is given as the first argument. The optional
29 second argument specifies the host name or address of a name server.
30 Options can also be specified on the command line if they precede the
32 arguments and are prefixed with a hyphen. For example, to change the
33 default query type to host information, and the initial timeout to 10
34 seconds, type:
35 nslookup -query=hinfo -timeout=10
37 The -version option causes nslookup to print the version number and
40 immediately exits.
41
43 host [server]
44 Look up information for host using the current default server or
45 using server, if specified. If host is an Internet address and the
46 query type is A or PTR, the name of the host is returned. If host
47 is a name and does not have a trailing period, the search list is
48 used to qualify the name.
49 To look up a host not in the current domain, append a period to the
51 name.
52 server domain
54 lserver domain
56 Change the default server to domain; lserver uses the initial
57 server to look up information about domain, while server uses the
58 current default server. If an authoritative answer can't be found,
59 the names of servers that might have the answer are returned.
60 root
62 not implemented
63 finger
65 not implemented
66 ls
68 not implemented
69 view
71 not implemented
72 help
74 not implemented
75 ?
77 not implemented
78 exit
80 Exits the program.
81 set keyword[=value]
83 This command is used to change state information that affects the
84 lookups. Valid keywords are:
85 all
87 Prints the current values of the frequently used options to
88 set. Information about the current default server and host is
89 also printed.
90 class=value
92 Change the query class to one of:
93 IN
95 the Internet class
96 CH
98 the Chaos class
99 HS
101 the Hesiod class
102 ANY
104 wildcard
105 The class specifies the protocol group of the information.
107 (Default = IN; abbreviation = cl)
109 [no]debug
111 Turn on or off the display of the full response packet and any
112 intermediate response packets when searching.
113 (Default = nodebug; abbreviation = [no]deb)
115 [no]d2
117 Turn debugging mode on or off. This displays more about what
118 nslookup is doing.
119 (Default = nod2)
121 domain=name
123 Sets the search list to name.
124 [no]search
126 If the lookup request contains at least one period but doesn't
127 end with a trailing period, append the domain names in the
128 domain search list to the request until an answer is received.
129 (Default = search)
131 port=value
133 Change the default TCP/UDP name server port to value.
134 (Default = 53; abbreviation = po)
136 querytype=value
138 type=value
140 Change the type of the information query.
141 (Default = A and then AAAA; abbreviations = q, ty)
143 Note: It is only possible to specify one query type, only the
145 default behavior looks up both when an alternative is not
146 specified.
147 [no]recurse
149 Tell the name server to query other servers if it does not have
150 the information.
151 (Default = recurse; abbreviation = [no]rec)
153 ndots=number
155 Set the number of dots (label separators) in a domain that will
156 disable searching. Absolute names always stop searching.
157 retry=number
159 Set the number of retries to number.
160 timeout=number
162 Change the initial timeout interval for waiting for a reply to
163 number seconds.
164 [no]vc
166 Always use a virtual circuit when sending requests to the
167 server.
168 (Default = novc)
170 [no]fail
172 Try the next nameserver if a nameserver responds with SERVFAIL
173 or a referral (nofail) or terminate query (fail) on such a
174 response.
175 (Default = nofail)
177
180 nslookup returns with an exit status of 1 if any query failed, and 0
181 otherwise.
182
184 If nslookup has been built with IDN (internationalized domain name)
185 support, it can accept and display non-ASCII domain names. nslookup
186 appropriately converts character encoding of domain name before sending
187 a request to DNS server or displaying a reply from the server. If you'd
188 like to turn off the IDN support for some reason, define the
189 IDN_DISABLE environment variable. The IDN support is disabled if the
190 variable is set when nslookup runs or when the standard output is not a
191 tty.
192
194 If nslookup has been built with IDN (internationalized domain name)
195 support, it can accept and display non-ASCII domain names. nslookup
196 appropriately converts character encoding of domain name before sending
197 a request to DNS server or displaying a reply from the server. If you'd
198 like to turn off the IDN support for some reason, define the
199 IDN_DISABLE environment variable. The IDN support is disabled if the
200 variable is set when nslookup runs.
201
203 /etc/resolv.conf
204
206 dig(1), host(1), named(8).
207
209 Internet Systems Consortium, Inc.
210
212 Copyright © 2004-2007, 2010, 2013-2021 Internet Systems Consortium,
213 Inc. ("ISC")
214ISC 2014-01-24 NSLOOKUP(1)