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Does single-label domain name mean a name like 'OurHouse'. Where as guy.ourhouse.com would not be a single-label domain. If so, would guy-ourhouse.com be a multi-label domain name?

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Yes, your assumption is (99%) correct.

What confuses it in a strict technical sense is the implicit '.' on the end of every domain name (at least in the underlying DNS wire protocol) which is a zero length label. However unless you're writing DNS software you don't need to worry about that ;-)

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Thank you just what I wanted to know – Guy Thomas Nov 30 '09 at 17:20
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A single-label domain name is where a particular server is just called 'guy' for instance, not 'guy.com' or 'www.guy.com' - just a basic name. Setting up clients to deal with single-label domains is more trouble than it's worth - it's all a bit 'old hat' to be honest, best avoided.

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I appreciated your answer – Guy Thomas Nov 30 '09 at 17:22
The following TLDs have A records: ac, ai, bi, cm, dk, gg, hk, io, je, mn, ph, pn, pw, sh, tk, tm, to, uz, and ws. I didn't look for three letter tlds. This is on the IPv4 network that people commonly call "the internet" using the commonly accepted root name servers. – chris Nov 30 '09 at 18:48

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