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><HEAD
><TITLE
>nslookup</TITLE
><META
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CONTENT="Modular DocBook HTML Stylesheet Version 1.7"></HEAD
><BODY
CLASS="REFENTRY"
BGCOLOR="#FFFFFF"
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><H1
><A
NAME="AEN1"
></A
>nslookup</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN8"
></A
><H2
>Name</H2
>nslookup -- query Internet name servers interactively</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN11"
></A
><H2
>Synopsis</H2
><P
><B
CLASS="COMMAND"
>nslookup</B
> [<VAR
CLASS="OPTION"
>-option</VAR
>] [name | -] [server]</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN18"
></A
><H2
>DESCRIPTION</H2
><P
><B
CLASS="COMMAND"
>Nslookup</B
>
is a program to query Internet domain name servers. <B
CLASS="COMMAND"
>Nslookup</B
>
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.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN23"
></A
><H2
>ARGUMENTS</H2
><P
>Interactive mode is entered in the following cases:
<P
></P
><OL
TYPE="a"
><LI
><P
>when no arguments are given (the default name server will be used)</P
></LI
><LI
><P
>when the first argument is a hyphen (-) and the second argument is
the host name or Internet address of a name server.</P
></LI
></OL
></P
><P
>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.</P
><P
>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:
<DIV
CLASS="INFORMALEXAMPLE"
><P
></P
><A
NAME="AEN33"
></A
><PRE
CLASS="PROGRAMLISTING"
>nslookup -query=hinfo -timeout=10</PRE
><P
></P
></DIV
></P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN35"
></A
><H2
>INTERACTIVE COMMANDS</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>host [<SPAN
CLASS="OPTIONAL"
>server</SPAN
>]</DT
><DD
><P
>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.</P
><P
>To look up a host not in the current domain, append a period to
the name.</P
></DD
><DT
><CODE
CLASS="CONSTANT"
>server</CODE
> <VAR
CLASS="REPLACEABLE"
>domain</VAR
></DT
><DD
><P
></P
></DD
><DT
><CODE
CLASS="CONSTANT"
>lserver</CODE
> <VAR
CLASS="REPLACEABLE"
>domain</VAR
></DT
><DD
><P
>Change the default server to <VAR
CLASS="REPLACEABLE"
>domain</VAR
>; <CODE
CLASS="CONSTANT"
>lserver</CODE
> uses the initial
server to look up information about <VAR
CLASS="REPLACEABLE"
>domain</VAR
>, while <CODE
CLASS="CONSTANT"
>server</CODE
> uses
the current default server. If an authoritative answer can't be
found, the names of servers that might have the answer are
returned.</P
></DD
><DT
><CODE
CLASS="CONSTANT"
>root</CODE
></DT
><DD
><P
>not implemented</P
></DD
><DT
><CODE
CLASS="CONSTANT"
>finger</CODE
></DT
><DD
><P
>not implemented</P
></DD
><DT
><CODE
CLASS="CONSTANT"
>ls</CODE
></DT
><DD
><P
>not implemented</P
></DD
><DT
><CODE
CLASS="CONSTANT"
>view</CODE
></DT
><DD
><P
>not implemented</P
></DD
><DT
><CODE
CLASS="CONSTANT"
>help</CODE
></DT
><DD
><P
>not implemented</P
></DD
><DT
><CODE
CLASS="CONSTANT"
>?</CODE
></DT
><DD
><P
>not implemented</P
></DD
><DT
><CODE
CLASS="CONSTANT"
>exit</CODE
></DT
><DD
><P
>Exits the program.</P
></DD
><DT
><CODE
CLASS="CONSTANT"
>set</CODE
> <VAR
CLASS="REPLACEABLE"
>keyword[<SPAN
CLASS="OPTIONAL"
>=value</SPAN
>]</VAR
></DT
><DD
><P
>This command is used to change state information that affects
the lookups. Valid keywords are:
<P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><CODE
CLASS="CONSTANT"
>all</CODE
></DT
><DD
><P
>Prints the current values of the frequently used
options to <B
CLASS="COMMAND"
>set</B
>. Information about the current default
server and host is also printed.
</P
></DD
><DT
><CODE
CLASS="CONSTANT"
>class=</CODE
><VAR
CLASS="REPLACEABLE"
>value</VAR
></DT
><DD
><P
> Change the query class to one of:
<P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><CODE
CLASS="CONSTANT"
>IN</CODE
></DT
><DD
><P
>the Internet class</P
></DD
><DT
><CODE
CLASS="CONSTANT"
>CH</CODE
></DT
><DD
><P
>the Chaos class</P
></DD
><DT
><CODE
CLASS="CONSTANT"
>HS</CODE
></DT
><DD
><P
>the Hesiod class</P
></DD
><DT
><CODE
CLASS="CONSTANT"
>ANY</CODE
></DT
><DD
><P
>wildcard</P
></DD
></DL
></DIV
>
The class specifies the protocol group of the information.
</P
><P
> (Default = IN; abbreviation = cl)
</P
></DD
><DT
><CODE
CLASS="CONSTANT"
><VAR
CLASS="REPLACEABLE"
>[<SPAN
CLASS="OPTIONAL"
>no</SPAN
>]</VAR
>debug</CODE
></DT
><DD
><P
> Turn debugging mode on. A lot more information is
printed about the packet sent to the server and the
resulting answer.
</P
><P
> (Default = nodebug; abbreviation = [<SPAN
CLASS="OPTIONAL"
>no</SPAN
>]deb)
</P
></DD
><DT
><CODE
CLASS="CONSTANT"
><VAR
CLASS="REPLACEABLE"
>[<SPAN
CLASS="OPTIONAL"
>no</SPAN
>]</VAR
>d2</CODE
></DT
><DD
><P
> Turn debugging mode on. A lot more information is
printed about the packet sent to the server and the
resulting answer.
</P
><P
> (Default = nod2)
</P
></DD
><DT
><CODE
CLASS="CONSTANT"
>domain=</CODE
><VAR
CLASS="REPLACEABLE"
>name</VAR
></DT
><DD
><P
> Sets the search list to <VAR
CLASS="REPLACEABLE"
>name</VAR
>.
</P
></DD
><DT
><CODE
CLASS="CONSTANT"
><VAR
CLASS="REPLACEABLE"
>[<SPAN
CLASS="OPTIONAL"
>no</SPAN
>]</VAR
>search</CODE
></DT
><DD
><P
> 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.
</P
><P
> (Default = search)
</P
></DD
><DT
><CODE
CLASS="CONSTANT"
>port=</CODE
><VAR
CLASS="REPLACEABLE"
>value</VAR
></DT
><DD
><P
> Change the default TCP/UDP name server port to <VAR
CLASS="REPLACEABLE"
>value</VAR
>.
</P
><P
> (Default = 53; abbreviation = po)
</P
></DD
><DT
><CODE
CLASS="CONSTANT"
>querytype=</CODE
><VAR
CLASS="REPLACEABLE"
>value</VAR
></DT
><DD
><P
></P
></DD
><DT
><CODE
CLASS="CONSTANT"
>type=</CODE
><VAR
CLASS="REPLACEABLE"
>value</VAR
></DT
><DD
><P
> Change the top of the information query.
</P
><P
> (Default = A; abbreviations = q, ty)
</P
></DD
><DT
><CODE
CLASS="CONSTANT"
><VAR
CLASS="REPLACEABLE"
>[<SPAN
CLASS="OPTIONAL"
>no</SPAN
>]</VAR
>recurse</CODE
></DT
><DD
><P
> Tell the name server to query other servers if it does not have the
information.
</P
><P
> (Default = recurse; abbreviation = [no]rec)
</P
></DD
><DT
><CODE
CLASS="CONSTANT"
>retry=</CODE
><VAR
CLASS="REPLACEABLE"
>number</VAR
></DT
><DD
><P
> Set the number of retries to number.
</P
></DD
><DT
><CODE
CLASS="CONSTANT"
>timeout=</CODE
><VAR
CLASS="REPLACEABLE"
>number</VAR
></DT
><DD
><P
> Change the initial timeout interval for waiting for a
reply to number seconds.
</P
></DD
><DT
><CODE
CLASS="CONSTANT"
><VAR
CLASS="REPLACEABLE"
>[<SPAN
CLASS="OPTIONAL"
>no</SPAN
>]</VAR
>vc</CODE
></DT
><DD
><P
> Always use a virtual circuit when sending requests to the server.
</P
><P
> (Default = novc)
</P
></DD
></DL
></DIV
></P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN218"
></A
><H2
>FILES</H2
><P
><TT
CLASS="FILENAME"
>/etc/resolv.conf</TT
></P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN222"
></A
><H2
>SEE ALSO</H2
><P
><SPAN
CLASS="CITEREFENTRY"
><SPAN
CLASS="REFENTRYTITLE"
>dig</SPAN
>(1)</SPAN
>,
<SPAN
CLASS="CITEREFENTRY"
><SPAN
CLASS="REFENTRYTITLE"
>host</SPAN
>(1)</SPAN
>,
<SPAN
CLASS="CITEREFENTRY"
><SPAN
CLASS="REFENTRYTITLE"
>named</SPAN
>(8)</SPAN
>.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN234"
></A
><H2
>Author</H2
><P
>Andrew Cherenson</P
></DIV
></BODY
></HTML
>
