NSLOOKUP(1)

NAME
nslookup - query Internet name servers interactively

SYNOPSIS

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:

    1. when no arguments are given (the default name server will be used)

    2. when the first argument is a hyphen (-) and the second argument is the host name or Internet address of a name server.

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]
    Look up information for host using the current default server or using server, if specified. If host is an Internet address and the query type is A or PTR, the name of the host is returned. If host is a name and does not have a trailing period, the search list is used to qualify the name.

    To look up a host not in the current domain, append a period to the name.

server domain

lserver domain
    Change the default server to domain; lserver uses the initial server to look up information about domain, while server uses the current default server. If an authoritative answer can't be found, the names of servers that might have the answer are returned.

root
    not implemented

finger
    not implemented

ls
    not implemented

view
    not implemented

help
    not implemented

?
    not implemented

exit
    Exits the program.

set keyword[=value]
    This command is used to change state information that affects the lookups. Valid keywords are:

    all
        Prints the current values of the frequently used options to set. Information about the current default server and host is also printed.

    class=value
        Change the query class to one of:

        IN
            the Internet class

        CH
            the Chaos class

        HS
            the Hesiod class

        ANY
            wildcard

        The class specifies the protocol group of the information.

        (Default = IN; abbreviation = cl)

    [no]debug
        Turn on or off the display of the full response packet and any intermediate response packets when searching.

        (Default = nodebug; abbreviation = [no]deb)

    [no]d2
        Turn debugging mode on or off. This displays more about what nslookup is doing.

        (Default = nod2)

    domain=name
        Sets the search list to name.

    [no]search
        If the lookup request contains at least one period but doesn't end with a trailing period, append the domain names in the domain search list to the request until an answer is received.

        (Default = search)

    port=value
        Change the default TCP/UDP name server port to value.

        (Default = 53; abbreviation = po)

    querytype=value

    type=value
        Change the type of the information query.

        (Default = A; abbreviations = q, ty)

    [no]recurse
        Tell the name server to query other servers if it does not have the information.

        (Default = recurse; abbreviation = [no]rec)

    ndots=number
        Set the number of dots (label separators) in a domain that will disable searching. Absolute names always stop searching.

    retry=number
        Set the number of retries to number.

    timeout=number
        Change the initial timeout interval for waiting for a reply to number seconds.

    [no]vc
        Always use a virtual circuit when sending requests to the server.

        (Default = novc)

    [no]fail
        Try the next nameserver if a nameserver responds with SERVFAIL or a referral (nofail) or terminate query (fail) on such a response.

        (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.

FILES

/etc/resolv.conf

SEE ALSO

dig(1), host(1), named(8).

AUTHOR

Internet Systems Consortium, Inc.

COPYRIGHT
Copyright © 2004-2007, 2010, 2013-2019 Internet Systems Consortium, Inc. ("ISC")