|NSLOOKUP(1)||General Commands Manual||NSLOOKUP(1)|
nslookup — query
Internet name servers interactively
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:
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
-version option causes
nslookup to print the version number and immediately
To look up a host not in the current domain, append a period to the name.
lserveruses the initial server to look up information about
serveruses the current default server. If an authoritative answer can't be found, the names of servers that might have the answer are returned.
set. Information about the current default server and host is also printed.
cl) Change the query class to one of:
The class specifies the protocol group of the information.
The default is
nodeb) Turn on or off the display of the full response packet and any intermediate response packets when searching. The default is
nofail) or terminate query (
fail) on such a response. The default is
po) Change the default TCP/UDP name server port to value. The default is port 53.
ty) Change the type of the information query. The default is ‘A’.
rec) Tell the name server to query other servers if it does not have the information. The default is
nslookup command returns with an exit
status of 1 if any query failed, and 0 otherwise.
Internet Systems Consortium, Inc.
|February 7, 2020||OpenBSD-current|