====National Classifications====
GN and HN are subdivided by nations. Two-letter codes are used for nations represented in the current TLD list found online at [https://en.wikipedia.org/wiki/List_of_Internet_topCountry_code_top-level_domainslevel_domain#Country_code_top-level_domains Lists Wikipedia]. (This source is preferred as there are a number of competing agencies and standards.) Nations not represented on this list are assigned two character cutter codes. Note that this results in nations being shelved out of strict alphabetical order (sometimes wildly so, as Switzerland uses CH).
New codes will be assigned as needed, using the Internet's Top Level Domain (TLD) list where possible, and Cutter numbers where not.