2000-12 2009-06-08 IANA allocation The configuration ROM for IP-capable nodes contains at least one unit directory that identifies a unit architecture specified by either RFC 2734 or RFC 3146. The 48-bit unit architecture identifier consists of a 24-bit Unit_Spec_ID value and a 24-bit Unit_SW_Version value; the use of these configuration ROM entries is specified by ISO/IEC 13213:1994. For IP (both IPv4 and IPv6) over 1394, the value of Unit_Spec_ID is 0x00 005E, the company ID assigned to IANA by the IEEE Registration Authority. The following values have been registered for the Unit_SW_Version: 0x00 0000 Reserved 0x00 0001 IPv4 over IEEE 1394 0x00 0002 IPv6 over IEEE 1394 0xFF FFFF Reserved Standards Action Section 9.1 of defines MCAP group address descriptors, which include an 8-bit type name space. 0 Reserved 1 IPv4 Multicast Address 2 IPv6 Multicast Address 3-254 Unassigned 255 Reserved