I noticed that looking at registrars some top-level-domains had different rules it seems. Like on some domains I can get a 3 letter second-level-domain but others say minimum 4 letters. Is there supposed to be some standard rule or is it just each top level registrar makes their own rules?


Each makes their own rules. There is no standard.

Many of the older ones, for example country-level specific, may want to restrict shorter ones to avoid confusion. For example, co.za doesn't allow two-character domain names.


It depends on the registrar. For example, Canada used to require hierarchical domain names:

If your company was in only one province, you had to get use a provincial sub-domain, e.g. company.bc.ca But if you were a national organization, you could get just company.ca

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