How can I set DNS for my website

[sip]

I have developed a website using LAMP. Right now we are accessing the website using ip address(in intranet) ie http://10.192.192.162/IntraWeb/index.php

I would like to access the web using name instead of ip address.
ie
http://www.projects.org/IntraWeb/index.php

How can I set DNS for accessing website in the intranet using name ie http://www.projects.org/ instead of ip address
How can I set DNS for accessing website in the internet using name ie http://www.projects.org/ instead of ip address

Thanks in advance

[cyberinstru]

Try this one. DynDNS: Domain name services including Dynamic DNS, Custom DNS, Recursive DNS and more