Diplomatic series (Code for International Organizations, 01 - 037)
currently there are 27 codes activ
Diplomatic series (Permanent Delegations of international organizations, 201 - 218, 253 and 254)
not all codes are issued, several codes are unknown, currently there are 19 delegations.
Diplomatic series (Conference on Disarmament, 300 - 373)
300 + country-code,
there has 14 representations in Geneva
Diplomatic series (WTO, 500 - 701)
500 + country-code,
only 36 of the 164 member states have a mission in Geneva