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Probably a Supid question &nbsp; but what type of entry(record) needs to be added? &nbsp; 
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Probably a Supid question   but what type of entry(record) needs to be added?  

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A reverse lookup is often referred to as reverse resolving, or more specifically reverse DNS lookup, and is accomplished using a &quot;reverse IN-ADDR entry&quot; in the form of a PTR record.<br />
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Just like &quot;Host A&quot; records returns IP Address, PTR records returns names for IP address.
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A reverse lookup is often referred to as reverse resolving, or more specifically reverse DNS lookup, and is accomplished using a "reverse IN-ADDR entry" in the form of a PTR record.

Just like "Host A" records returns IP Address, PTR records returns names for IP address.

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I have many websites running on a server with one IP address &nbsp;how Do I set on A or MX record as the primary so when I do an ns look up I get mail.myycompany.com instead of &nbsp;mail.ahostedwebsite.com?<br />
whn I do an NS lookup of my WEB server's IP 199.190.202.80 &nbsp;i get advantageauto.ntslink.com &nbsp;I want it to be <a href="http://www.ntslink.com" rel="ugc">www.ntslink.com</a>....<br />
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any help? &nbsp; thanks in advance!
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I have many websites running on a server with one IP address  how Do I set on A or MX record as the primary so when I do an ns look up I get mail.myycompany.com instead of  mail.ahostedwebsite.com?
whn I do an NS lookup of my WEB server's IP 199.190.202.80  i get advantageauto.ntslink.com  I want it to be www.ntslink.com....

any help?   thanks in advance!

How do I set a Primary A / MX Record for an IP address?

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).