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Command: nslookup | Section: 1 | Source: OpenBSD | File: nslookup.1
NSLOOKUP(1) FreeBSD General Commands Manual NSLOOKUP(1)
NAME
nslookup - query Internet name servers interactively
SYNOPSIS
nslookup [-option] [name | -] [server]
DESCRIPTION
The nslookup command queries 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.
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
exit Exit the program.
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.
lserver domain
server 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.
set keyword=value
This command is used to change state information that affects the
lookups. Some keywords may be abbreviated, as shown in
parentheses. 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
(cl) Change the query class to one of:
ANY wildcard
CH the Chaos class
HS the Hesiod class
IN the Internet class
The class specifies the protocol group of the
information. The default is IN.
[no]d2 Turn debugging mode on or off. This displays more about
what nslookup is doing. The default is nod2.
[no]debug
(nodeb) Turn on or off the display of the full response
packet and any intermediate response packets when
searching. The default is nodebug.
domain=name
Sets the search list to name.
[no]fail
Try the next name server if a name server responds with
SERVFAIL or a referral (nofail) or terminate query (fail)
on such a response. The default is nofail.
ndots=number
Set the number of dots (label separators) in a domain
that will disable searching. Absolute names always stop
searching.
port=value
(po) Change the default TCP/UDP name server port to
value. The default is port 53.
[query]type=value
(q, ty) Change the type of the information query. The
default is `A'.
[no]recurse
(rec) Tell the name server to query other servers if it
does not have the information. The default is recurse.
retry=number
Set the number of retries to number.
[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. The default is search.
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. The default is novc.
? not implemented
finger not implemented
help not implemented
ls not implemented
root not implemented
view not implemented
FILES
/etc/resolv.conf
EXIT STATUS
The nslookup command returns with an exit status of 1 if any query
failed, and 0 otherwise.
SEE ALSO
dig(1), host(1)
AUTHORS
Internet Systems Consortium, Inc.
FreeBSD 14.1-RELEASE-p8 February 7, 2020 FreeBSD 14.1-RELEASE-p8