Q. OSI Network Layer Addressing

• ISO/IEC and CCITT mutually administer the global network addressing domain. The primary hierarchical decomposition of the address is defined by (ISO/IEC 8348).
• The standard specifies the syntax as well as the allowable values for the high-order part of the address - the Initial Domain Part (IDP) that consists of the Authority and Format Identifier (AFI) and the Initial Domain Identifier (IDI) - but purposely eschews constraints on or recommendations concerning the syntax or semantics of the domain specific part (DSP).