Nslookup may be described as a computer program which is utilized in UNIX or Windows to query Domain Name system servers so as to find DNS details similar to IP addressees of a pc, NS servers of a website and MX records for a domain. For individuals who have never worked with DNS, nslookup is sort of confusing as it has rich syntax. Although Windows and UNIX can utilize nslookup, there are several variations especially the way it runs on the two operating systems. This article will teach you how to use nslookup.
If the user’s site has been linked to the internet, one may use the nslookup (one) program to find MX or some other records. To start out running nslookup, one must first type its name. One should nevertheless give the complete pathname. In SunOS, nslookup will be present in /usr/and so on directory while in Ultrix it’s present in /usr/ucb and finally under HP-UX it is in /usr /bin. As nlookup is operating, it will 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) through the use of the set command; [14] Beginning with V8.7 sendmail. One may utilize the /mx command. The subsequent step after this would be to lookup 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 end informs nslookup (1) that the default domain must not be appended before the look up. The output that’s produced by the hook up can have the two lines exhibiting the IP address and the name of the local DNS server. The other three lines that follow, show that sendmail.org domain comprises 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 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 end exhibits 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 appear like it is a 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 need “A” records and “www” is an instance of such a machine.
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