System Administration Commands nslookup(1M)
NAME
nslookup - query Internet name servers interactively
SYNOPSIS
nslookup [-option] [name -] [server]
DESCRIPTION
The nslookup utility is a program to query Internet domain
name servers. It 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.
PARAMETERS
Interactive mode is entered in the following cases:
1. No arguments are given (the default name server is
used).
2. 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 informa-
tion, and the initial timeout to 10 seconds, type:
nslookup -query=hinfo -timeout=10
INTERACTIVE COMANDS
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.
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System Administration Commands nslookup(1M)
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
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System Administration Commands nslookup(1M)
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 infor-
mation.
(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)
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System Administration Commands nslookup(1M)
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 top 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
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System Administration Commands nslookup(1M)
to the server.
(Default = novc)
FILES
/etc/resolv.conf
resolver configuration file
ATRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
ATRIBUTE TYPE ATRIBUTE VALUE
Availability SUNWbind
Interface Stability External
SEE ALSO
dig(1M), host(1M), named(1M), attributes(5)
NOTES
nslookup and dig(1M) now report "Not Implemented" as NOTIMP
rather than NOTIMPL. This will have impact on scripts that
are looking for NOTIMPL.
BIND 9 nslookup is deprecated and not as full featured as
its former BIND 8 version. For more features and functional-
ity refer to dig(1M).
SunOS 5.11 Last change: 24 Dec 2008 5
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