Network Working Group J. Reynolds Request for Comments: 1700 J ...

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RFC 1700 Assigned Numbers October 1994NOTE: Ethernet 48-bit address blocks are assigned by the IEEE.IEEE Registration Authorityc/o Iris RingelIEEE Standards Department445 Hoes Lane, P.O. Box 1331Piscataway, NJ 08855-1331Phone +1 908 562 3813Fax: +1 908 562 1571IANA ETHERNET ADDRESS BLOCKThe IANA owns an Ethernet address block which may be used formulticast address asignments or other special purposes.The address block in IEEE binary is: 0000 0000 0000 0000 0111 1010In the normal Internet dotted decimal notation this is 0.0.94 sincethe bytes are transmitted higher order first and bits within bytes aretransmitted lower order first (see "Data Notation" in theIntroduction).IEEE CSMA/CD and Token Bus bit transmission order: 00 00 5EIEEE Token Ring bit transmission order: 00 00 7AAppearance on the wire (bits transmitted from left to right):0 23 47| | |1000 0000 0000 0000 0111 1010 xxxx xxx0 xxxx xxxx xxxx xxxx| |Multicast Bit0 = Internet Multicast1 = Assigned by IANA forother usesAppearance in memory (bits transmitted right-to-left within octets,octets transmitted left-to-right):0 23 47| | |0000 0001 0000 0000 0101 1110 0xxx xxxx xxxx xxxx xxxx xxxx| |Multicast Bit0 = Internet MulticastReynolds & Postel [Page 172]
RFC 1700 Assigned Numbers October 19941 = Assigned by IANA for other usesThe latter representation corresponds to the Internet standardbit-order, and is the format that most programmers have to deal with.Using this representation, the range of Internet Multicast addressesis:01-00-5E-00-00-00 to 01-00-5E-7F-FF-FF in hex, or1.0.94.0.0.0 to 1.0.94.127.255.255 in dotted decimalETHERNET VENDOR ADDRESS COMPONENTSEthernet hardware addresses are 48 bits, expressed as 12 hexadecimaldigits (0-9, plus A-F, capitalized). These 12 hex digits consist ofthe first/left 6 digits (which should match the vendor of the Ethernetinterface within the station) and the last/right 6 digits whichspecify the interface serial number for that interface vendor.Ethernet addresses might be written unhyphenated (e.g., 123456789ABC),or with one hyphen (e.g., 123456-789ABC), but should be writtenhyphenated by octets (e.g., 12-34-56-78-9A-BC).These addresses are physical station addresses, not multicast norbroadcast, so the second hex digit (reading from the left) will beeven, not odd.At present, it is not clear how the IEEE assigns Ethernet blockaddresses. Whether in blocks of 2**24 or 2**25, and whethermulticasts are assigned with that block or separately. A portion ofthe vendor block address is reportedly assigned serially, with theother portion intentionally assigned randomly. If there is a globalalgorithm for which addresses are designated to be physical (in achipset) versus logical (assigned in software), or globally-assignedversus locally-assigned addresses, some of the known addresses do notfollow the scheme (e.g., AA0003; 02xxxx).00000C Cisco00000E Fujitsu00000F NeXT000010 Sytek00001D Cabletron000020 DIAB (Data Intdustrier AB)000022 Visual Technology00002A TRWReynolds & Postel [Page 173]
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