Nslookup: Difference between revisions
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==External links== |
==External links== |
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[http://www.scanipv6.com Free Online Network Tools - nslookup]This www.scanipv6.com website has fully customizable functions for reverse dns lookup/resolve a host, domain whois, ip whois, ns lookup, dig, ping, traceroute, tracepath, port scanner, nmap, and it can even determine the country in which the target host/ip is located. |
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* Microsoft Windows |
* Microsoft Windows |
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** [http://technet.microsoft.com/en-us/library/bb490721.aspx nslookup] – [[Microsoft TechNet]] library |
** [http://technet.microsoft.com/en-us/library/bb490721.aspx nslookup] – [[Microsoft TechNet]] library |
Revision as of 02:27, 5 June 2012
nslookup is a network administration command-line tool available for many computer operating systems for querying the Domain Name System (DNS) to obtain domain name or IP address mapping or for any other specific DNS record.
Background
The name nslookup means name server lookup. Nslookup uses the operating system's local Domain Name System resolver library to perform its queries. Thus, it is configured automatically by the contents of the operating system file resolv.conf.[1]
Even though the nslookup program is very old, it is still installed by default on most versions of Windows including Windows XP, Windows Vista, and Windows 7.
Usage
nslookup operates in interactive or non-interactive mode. When used interactively, when the program is invoked without arguments (another option exists), the user issues parameter configurations or requests when presented the nslookup prompt ('>') in line by line fashion. In non-interactive mode parameters and the query are specified as command line arguments in the invocation of the program.
The general command syntax is:
nslookup [-option] [name | -] [server]
Example
The following example queries the Domain Name System for the IP address of the domain name example.com by issuing the command nslookup example.com to the command line interpreter (shell):
$ nslookup example.com
Server: 192.168.0.254
Address: 192.168.0.254#53
Non-authoritative answer:
Name: example.com
Address: 192.0.32.10
(The response is non-authoritative.)
This is an example of interactive, prompted use of the nslookup application. The user executes the program without any arguments and issues parameters and queries at the program prompt ('>'):
$ nslookup
Default Server: dsldevice.lan
Address: 192.168.1.1
> server 8.8.8.8
Default Server: google-public-dns-a.google.com
Address: 8.8.8.8
> set type=mx
> wikipedia.org
Server: google-public-dns-a.google.com
Address: 8.8.8.8
Non-authoritative answer:
wikipedia.org MX preference = 10, mail exchanger = mchenry.wikimedia.org
wikipedia.org MX preference = 50, mail exchanger = lists.wikimedia.org
> exit
In this example, the program first displays its default name server configuration, after which the user changes the name server to be used to the host at IP address 8.8.8.8. The type of query to be performed is specified by setting the type of record to be fetched (MX record). Finally, the user simply issues the domain name at the prompt to receive the query results. The command exit ends the interactive session and terminates the program.
See also
- Domain Information Groper (dig)
- whois
- host (Unix), a simple utility for performing Domain Name System lookups
References
- ^ "DNS and BIND, Fourth Edition: Chapter 12. nslookup and dig". O'Reilly. Retrieved 2010-07-20.
External links
Free Online Network Tools - nslookupThis www.scanipv6.com website has fully customizable functions for reverse dns lookup/resolve a host, domain whois, ip whois, ns lookup, dig, ping, traceroute, tracepath, port scanner, nmap, and it can even determine the country in which the target host/ip is located.
- Microsoft Windows
- nslookup – Microsoft TechNet library
- Using NSlookup.exe - Microsoft Knowledgebase
- Unix-like OSs
- The Single UNIX Specification, Version 4 from The Open Group – Shell and Utilities Reference,
- Other
- Template:Dmoz (includes web-version of nslookup)