Nslookup

From Wikipedia, the free encyclopedia

The nslookup command can be used in Windows and Unix to find the IP addresses of a particular computer, using DNS lookup. The name means "name server lookup". The most common version of the program is included as part of the BIND package. A more modern alternative to nslookup is the dig program, also shipping with BIND.

[edit] Example usage

$ nslookup www.wikipedia.org
Server:  ns0.southern.edu
Address:  216.229.224.4

Non-authoritative answer:
Name:    www.wikipedia.org
Addresses:  207.142.131.248, 207.142.131.235, 207.142.131.236, 207.142.131.245 207.142.131.246, 207.142.131.247

[edit] Interpretation of the result

The first two lines are information about the server delivering the answer to the nslookup requested by the user. The next 2 lines tell the user the name and IP of the machine being looked up.

[edit] External links

• DNSstuff.com. Why nslookup is a good tool. Retrieved on June 20, 2006.^{[dead link]}
• Jonathan de Boyne Pollard. nslookup is a badly flawed tool. Don't use it.. Frequently Given Answers. Retrieved on August 4, 2005.
• Brad Knowles (2001-07-06). "nslookup flaws". comp.protocols.dns.bind. (Google Groups). — 4 flaws in nslookup
• Barry Margolin (2001-07-06). "nslookup flaws". comp.protocols.dns.bind. (Google Groups). — a 5th flaw in nslookup
• Daniel J. Bernstein. Notes on nslookup. Retrieved on August 4, 2005.