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ASSUMPTIONS

   1. A "name" (Net, Host, Gateway, or Domain name) is a text string up
   to 24 characters drawn from the alphabet (A-Z), digits (0-9), minus
   sign (-), and period (.).  Note that periods are only allowed when
   they serve to delimit components of "domain style names". (See
   RFC-921, "Domain Name System Implementation Schedule", for
   background).  No blank or space characters are permitted as part of a
   name. No distinction is made between upper and lower case.  The first
   character must be an alpha character.  The last character must not be
   a minus sign or period.  A host which serves as a GATEWAY should have
   "-GATEWAY" or "-GW" as part of its name.  Hosts which do not serve as
   Internet gateways should not use "-GATEWAY" and "-GW" as part of
   their names. A host which is a TAC should have "-TAC" as the last
   part of its host name, if it is a DoD host.  Single character names
   or nicknames are not allowed.

RFC 1101 - DNS encoding of network names and other types

3.1. Network name syntax

   The current syntax for network names, as defined by [RFC 952] is an
   alphanumeric string of up to 24 characters, which begins with an
   alpha, and may include "." and "-" except as first and last
   characters.  This is the format which was also used for host names
   before the DNS.  Upward compatibility with existing names might be a
   goal of any new scheme.