What's a "normal" ratio of web sites to IP addresses...

[Bill Woodcock <woody () pch net>]

…in a run-of-the-mill web hoster?

This is really a question specifically for folks with web-site-hosting businesses.

If you had, say, ten million web site customers, each with their own unique domain name, how many IPv4 addresses would 
you think was a reasonable number to host those on?  HTTP name-based virtual-hosting means that you could, 
hypothetically, pile all ten million into a single IP address.  At the other end of the spectrum, you could chew up ten 
million IPv4 addresses, giving a unique one to each customer.  Presumably the actual practice lies somewhere 
in-between.  But what ratio do people in that business think is reasonable?  10:1?  100:1?  1,000:1?

I’m happy to take private replies and summarize/anonymize back to the list, if people prefer.

Thanks!

                                -Bill

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