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NAME¶nslookup - query Internet name servers interactively
nslookup [-option] [name | -] [server]
DESCRIPTION¶Nslookup is a program to query Internet domain name servers. Nslookup has two modes: interactive and non-interactive. Interactive mode allows the user to query name servers for information about various hosts and domains or to print a list of hosts in a domain. Non-interactive mode is used to print just the name and requested information for a host or domain.
ARGUMENTS¶Interactive mode is entered in the following cases:
Non-interactive mode is used when the name or Internet address of the host to be looked up is given as the first argument. The optional second argument specifies the host name or address of a name server.
Options can also be specified on the command line if they precede the arguments and are prefixed with a hyphen. For example, to change the default query type to host information, and the initial timeout to 10 seconds, type:
nslookup -query=hinfo -timeout=10
The -version option causes nslookup to print the version number and immediately exits.
INTERACTIVE COMMANDS¶host [server]
To look up a host not in the current domain, append a period to the name.
The class specifies the protocol group of the information.
(Default = IN; abbreviation = cl)
(Default = nodebug; abbreviation = [no]deb)
(Default = nod2)
(Default = search)
(Default = 53; abbreviation = po)
(Default = A and then AAAA; abbreviations = q, ty)
Note: It is only possible to specify one query type, only the default behavior looks up both when an alternative is not specified.
(Default = recurse; abbreviation = [no]rec)
(Default = novc)
(Default = nofail)
RETURN VALUES¶nslookup returns with an exit status of 1 if any query failed, and 0 otherwise.
IDN SUPPORT¶If nslookup has been built with IDN (internationalized domain name) support, it can accept and display non-ASCII domain names. nslookup appropriately converts character encoding of domain name before sending a request to DNS server or displaying a reply from the server. If you'd like to turn off the IDN support for some reason, define the IDN_DISABLE environment variable. The IDN support is disabled if the variable is set when nslookup runs or when the standard output is not a tty.
SEE ALSO¶dig(1), host(1), named(8).
AUTHOR¶Internet Systems Consortium, Inc.
COPYRIGHT¶Copyright © 2004-2007, 2010, 2013-2020 Internet Systems Consortium, Inc. ("ISC")