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nslookup - query Internet name servers interactively

 

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.
        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)
 
                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)
 

FILES

        /etc/resolv.conf
        dig(1), host(1), named(8).
 

AUTHOR

        Andrew Cherenson
 

COPYRIGHT

        Copyright © 2004-2007 Internet Systems Consortium, Inc. ("ISC")
 

Sections

Based on BSD UNIX
FreeBSD is an advanced operating system for x86 compatible (including Pentium and Athlon), amd64 compatible (including Opteron, Athlon64, and EM64T), UltraSPARC, IA-64, PC-98 and ARM architectures. It is derived from BSD, the version of UNIX developed at the University of California, Berkeley. It is developed and maintained by a large team of individuals. Additional platforms are in various stages of development.