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I'm not sure what you're trying to say, but www is just another subdomain. http://www.pizza is technically no different from http://superawesometasty.pizza.

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No - if pizza is owned by one TLD registrar www.pizza and great.pizza would be two separate subdomains under that TLD. I'm not sure there are limitations to the subdomain under the TLD (to prevent collision with www). Someone can register www under .com and make a www.www.com.

I wasn't saying they were interchangeable, just that on a technical level http://www.pizza and http://great.pizza function in exactly the same way, as far as DNS is concerned.

Unfortunately, the same can't be said for most browsers, but that's another topic...

And I'm sure www is a reserved term under most of the new TLDs. Haven't checked though.

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