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 argu-
ment 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 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 Change the default server to domain; lserver
lserver domain uses the initial server to look up informa-
tion 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 fre-
quently 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 debugging mode on. More information
is printed about the packet sent to the
server and the resulting answer.
(Default = nodebug; abbreviation =
[no]deb)
[no]d2 Turn debugging mode on. A lot more
information is printed about the packet
sent to the server and the resulting
answer. (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 trail-
ing 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; abbrevia-
tion = po)
querytype=value Change the top of the information query.
type=value (Default = A; abbreviations = q, ty)
[no]recurse Tell the name server to query other
servers if it does not have the informa-
tion. (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 send-
ing requests to the server. (Default =
novc)
FILES
/etc/resolv.conf resolver configuration file
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Availability | SUNWbind9 |
| Interface Stability | External |
|_____________________________|_____________________________|
SEE ALSO
dig(1M), host(1M), named(1M), attributes(5)
NOTES
Source for BIND9 is available in the SUNWbind9S package.
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