How To Use Nslookup

Nslookup may be described as a pc program which is used in UNIX or Windows to query

Domain Name system servers so as to find DNS particulars similar to IP addressees of a pc, NS servers of a site and MX records for a domain. For individuals who have never worked with DNS, nslookup is quite confusing because it has rich syntax. Although Windows and UNIX can utilize nslookup, there are a number of differences especially how it runs on the two operating systems. This article will educate you how to use nslookup.

If the user's site has been linked to the internet, one could use the nslookup (one) program to find MX or some other records. To start out running nslookup, one must first type its name. One must nevertheless give the whole pathname. In SunOS, nslookup can be found in /usr/etc directory while in Ultrix it's found in /usr/ucb and finally below HP-UX it's in /usr /bin. As nlookup is operating, it'll print ones default name server's name and then the machines IP address and finally the character ">."

One can instruct the nslookup to lookup MX records (14) through the use of the set command; [14] Beginning with V8.7 sendmail. One can even utilize the /mx command. The next step after this would be to lookup a number of actual domains and hosts. First one should lookup "sendmail.org" domain by first entering its name after the prompt. The dot at the end informs nslookup (1) that the default domain must not be appended before the look up. The output that is produced by the hook up will have the two 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, exactly mail.mailsite.rutgers.edu. [15]. In case the machine isn't accepting the mail or is down, the message is directed to the machine that has subsequent higher cost. The three lines at the end shows the IP addresses for the machines.

The last thing that one would be required to do will be to lookup UUCP host "www" entering its name to appear like it's 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.

by: maxwriter

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