Accessible Site...Without a Domain

Hey everyone,
Just a random question, is it possible to have a publically accessible website without a domain name attached to it? That is if I assign the server an IP address and have apache listen on 80 for incoming requests, can someone type that IP address into their browser and get to the page? It seems to me that the way DNS works, it requires you to have a domain name paired with it? Because even PTR reverse look ups of IP's are associated with a domain...

Thanks,

Absolutely.

Regards,
Alister

If this is the case, then what would a dig or nslookup, look like if you did it for a site with not domain name associated with it? Would it have just a blank A record?

---------- Post updated at 08:16 PM ---------- Previous update was at 07:38 PM ----------

Answered my own question, the IP address, just points itself.