Nslookup may be described as a pc program which is utilized in UNIX or Windows to query Domain Name system servers in order to find DNS details similar to IP addressees of a pc, NS servers of a domain and MX records for a domain. For those who have never worked with DNS, nslookup is kind of complicated because it has rich syntax. Though Windows and UNIX can utilize nslookup, there are several differences especially how it runs on the 2 operating systems. This article will teach you how to use nslookup.
If the user's web site has been linked to the internet, one might use the nslookup (one) program to find MX or another records. To start operating nslookup, one must first type its name. One should however give the complete pathname. In SunOS, nslookup will be present in /usr/etc directory whereas in Ultrix it is present in /usr/ucb and at last under HP-UX it is in /usr /bin. As nlookup is running, it'll print ones default name server's name and then the machines IP address and at last the character ">."
One can instruct the nslookup to search for MX records (14) by using the set command; [14] Beginning with V8.7 sendmail. One also can utilize the /mx command. The next step after this would be to search for several actual domains and hosts. First one should search for "sendmail.org" domain by first getting into its name after the prompt. The dot at the finish informs nslookup (1) that the default domain should not be appended earlier than the look up. The output that's produced by the hook up will have the 2 lines showing the IP address and the name of the local DNS server. The other three lines that comply with, show that sendmail.org domain contains three MX records.
The mail addressed to the domain is directed to the machine that has the lowest, precisely mail.mailsite.rutgers.edu. [15]. In case the machine will not be accepting the mail or is down, the message is directed to the machine that has subsequent greater cost. The three lines at the finish reveals the IP addresses for the machines.
The last thing that one would be required to do will be to search for UUCP host "www" entering its name to seem like it is part of the domain (yahoo.com). The output that will be produced will show that the host "www" has an MX record. Machines with MX records do not have "A" records and "www" is an example of such a machine.
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I hope this article helped you gain a basic understanding of the system. If you want to know how to use it as an advanced user, read my article how to use nslookup
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Article Source: http://www.bharatbhasha.net
Article Url: http://www.bharatbhasha.net/technology.php/231206
Article Added on Tuesday, April 13, 2010
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