What characters can a domain name have? How long can domain names be? Are there other restrictions on domain names?
Domain Names under the .SH Top Level Domain are expected to abide by the following rules:
* they must be between 3 and 63 Characters, when .SH is included
* domain names must contain only the characters A to Z, the numbers 0 to 9, and the dash " - ", and underscore "_" symbols which cannot be placed at the beginning or the end.
