Originally posted by Super-Supra
Alright, I might buy hosting at mediatemple.net, but I'm wondering if I don't buy a domain can I still be hosting at a eg. 84.3994.2299 address or something?
Domain Names are merely human-readable addresses. A remote system running DNS (Domain Name Services) then turns that address into an IP address, which is a 4-group two-byte number between 0.0.0.0 and 255.255.255.255.
If you buy a domain, you need to register it to an IP address, which will be the address of your server. All web servers provided by professional hosts have static IP addresses. So, when you register the domain, the DNS record for that domain has vital pieces of information in it. The minimum you require for a valid DNS record is:
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Definitive DNS: the IP address of the DNS server that is regarded to contain the definitive data concerning this DNS record.
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WWW Server: the IP address of a web server that answers this domain
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Mail eXchange: the IP address of a mail server that handles mail for this domain.
Fundamentally, the easiest thing to do is to get your web host to register the domain on your behalf. You are then the owner of the domain, but they are the Registrant, and it's up to them to ensure that the DNS record contains valid information.