Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

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

share|improve this question
up vote 2 down vote accepted

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 ;-)

share|improve this answer
Thank you just what I wanted to know – Guy Thomas Nov 30 '09 at 17:20

A single-label domain name is where a particular server is just called 'guy' for instance, not '' or '' - 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.

share|improve this answer
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

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.