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If I observe the domain:

http://www.google.com/

http is the protocal

www is a subdomain

google is the second level domain

com is the top level domain

Is there a specific term that would describe google.com?

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marked as duplicate by Iain, RobM, TheCleaner, Ward, pauska Oct 14 '13 at 23:20

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serverfault.com/questions/222095/… –  Iain Oct 14 '13 at 21:03
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www. is not a subdomain if it is a host (*). Also any domain that is part of a larger domain in the tree is a subdomain. google is a subdomain of .com –  JamesRyan Oct 14 '13 at 21:11
    
* it could be argued that it is both a hostname and subdomain. But definately A subdomain rather than THE subdomain –  JamesRyan Oct 14 '13 at 21:17
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3 Answers 3

You've already answered your own question. google.com would commonly be referred to as a second-level domain name.

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From wikipedia for second level domain: "in example.com, example is the second-level domain of the .com TLD." –  K2xL Oct 14 '13 at 21:08
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@K2xL right, I think you're reading the wikipedia article a little too literally. The google portion can be called a second-level domain, I suppose, but it's useless without knowing the TLD. I've never heard anyone refer to a second-level domain and only mean the piece to the left of the TLD. –  MDMarra Oct 14 '13 at 21:21
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"Naked domain". Also, in DNS terms - "zone apex"

Also, "second level domain". You wrongly assume that "example" part in "example.com" may be called second-level domain. The whole "example.com" is a domain, and it is a second-level domain."example" would be second label in the domain name. "com" is a first (rightmost) label.

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Parent Domain which is the combination of the Second Level Domain and the Top level domain

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Wouldn't www.google.com be a FQDN? –  K2xL Oct 14 '13 at 21:02
    
Thanks, update, my understanding was that google.com would be classed as an FQDN and a little research confirmed that, although with comments and proper research I was wrong –  Sam Leach Oct 14 '13 at 21:20
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