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Ethernet Numbers Connected: An Internet Encyclopedia
Ethernet Numbers

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Ethernet Numbers

Ethernet Numbers


ETHER TYPES

Many of the networks of all classes are Ethernets (10Mb) or
Experimental Ethernets (3Mb).  These systems use a message "type"
field in much the same way the ARPANET uses the "link" field.

If you need an Ether Type, contact:

Xerox Corporation
1350 Jefferson Rd.
Rochester, NY 14623
USA

Contact: Neil Sembower
Phone: 716-427-5033
EMail: sembower@eso.mc.xerox.com

The following list of EtherTypes is contributed unverified information
from various sources.  Another list of EtherTypes is maitained by
Michael A. Patton and is accessible at:

    <URL:http://www.cavebear.com/CaveBear/ether-codes.html>
    <URL:ftp://ftp.cavebear.com/pub/Ethernet-codes>
    <URL:gopher://ftp.cavebear.com/00/pub/Ethernet-codes>


Assignments:

Ethernet          Exp. Ethernet    Description          References
-------------     -------------   -----------           ----------
decimal  Hex      decimal  octal
  0000   0000-05DC   -       -    IEEE802.3 Length Field   [XEROX]
  0257   0101-01FF   -       -    Experimental             [XEROX]  
  0512   0200        512   1000   XEROX PUP (see 0A00)   [8,XEROX]
  0513   0201        -      -     PUP Addr Trans (see 0A01)[XEROX]
         0400                     Nixdorf                  [XEROX]
  1536   0600       1536   3000   XEROX NS IDP         [133,XEROX]
         0660                     DLOG                     [XEROX]
         0661                     DLOG                     [XEROX]
  2048   0800        513   1001   Internet IP (IPv4)     [105,JBP]
  2049   0801        -      -     X.75 Internet            [XEROX]
  2050   0802        -      -     NBS Internet             [XEROX]
  2051   0803        -      -     ECMA Internet            [XEROX]
  2052   0804        -      -     Chaosnet                 [XEROX]
  2053   0805        -      -     X.25 Level 3             [XEROX]
  2054   0806        -      -     ARP                     [88,JBP]
  2055   0807        -      -     XNS Compatability        [XEROX]
  2056   0808        -      -     Frame Relay ARP        [RFC1701]
  2076   081C        -      -     Symbolics Private         [DCP1]
  2184   0888-088A   -      -     Xyplex                   [XEROX]
  2304   0900        -      -     Ungermann-Bass net debugr[XEROX]
  2560   0A00        -      -     Xerox IEEE802.3 PUP      [XEROX]
  2561   0A01        -      -     PUP Addr Trans           [XEROX]
  2989   0BAD        -      -     Banyan VINES             [XEROX]
  2990   0BAE        -      -     VINES Loopback         [RFC1701]
  2991   0BAF        -      -     VINES Echo             [RFC1701]
  4096   1000        -      -     Berkeley Trailer nego    [XEROX]
  4097   1001-100F   -      -     Berkeley Trailer encap/IP[XEROX]
  5632   1600        -      -     Valid Systems            [XEROX]
 16962   4242        -      -     PCS Basic Block Protocol [XEROX]
 21000   5208        -      -     BBN Simnet               [XEROX]
 24576	 6000        -      -     DEC Unassigned (Exp.)    [XEROX]
 24577   6001        -      -     DEC MOP Dump/Load        [XEROX]
 24578   6002        -      -     DEC MOP Remote Console   [XEROX]
 24579   6003        -      -     DEC DECNET Phase IV Route[XEROX]
 24580   6004        -      -     DEC LAT                  [XEROX]
 24581   6005        -      -     DEC Diagnostic Protocol  [XEROX]
 24582   6006        -      -     DEC Customer Protocol    [XEROX]
 24583   6007        -      -     DEC LAVC, SCA            [XEROX]
 24584   6008-6009   -      -     DEC Unassigned           [XEROX]
 24586   6010-6014   -      -     3Com Corporation         [XEROX]
 25944   6558        -      -     Trans Ether Bridging   [RFC1701]
 25945   6559        -      -     Raw Frame Relay        [RFC1701]
 28672   7000        -      -     Ungermann-Bass download  [XEROX]
 28674   7002        -      -     Ungermann-Bass dia/loop  [XEROX] 
 28704   7020-7029   -      -     LRT                      [XEROX]
 28720   7030        -      -     Proteon                  [XEROX]
 28724   7034        -      -     Cabletron                [XEROX]
 32771   8003        -      -     Cronus VLN            [131,DT15]
 32772   8004        -      -     Cronus Direct         [131,DT15]
 32773   8005        -      -     HP Probe                 [XEROX]
 32774   8006        -      -     Nestar                   [XEROX]
 32776   8008        -      -     AT&T                     [XEROX]
 32784   8010        -      -     Excelan                  [XEROX]
 32787   8013	     -      -     SGI diagnostics            [AXC]
 32788   8014        -      -     SGI network games          [AXC]
 32789   8015        -      -     SGI reserved               [AXC]
 32790   8016	     -      -     SGI bounce server          [AXC]
 32793   8019        -      -     Apollo Domain            [XEROX]
 32815   802E        -      -     Tymshare                 [XEROX]
 32816   802F        -      -     Tigan, Inc.              [XEROX]
 32821   8035        -      -     Reverse ARP             [48,JXM]
 32822   8036        -      -     Aeonic Systems           [XEROX]
 32824   8038        -      -     DEC LANBridge            [XEROX]
 32825   8039-803C   -      -     DEC Unassigned           [XEROX]
 32829   803D        -      -     DEC Ethernet Encryption  [XEROX]
 32830   803E        -      -     DEC Unassigned           [XEROX]
 32831   803F        -      -     DEC LAN Traffic Monitor  [XEROX]
 32832   8040-8042   -      -     DEC Unassigned           [XEROX]
 32836   8044        -      -     Planning Research Corp.  [XEROX]
 32838   8046        -      -     AT&T                     [XEROX]
 32839   8047        -      -     AT&T                     [XEROX]
 32841   8049        -      -     ExperData                [XEROX]   
 32859   805B        -      -     Stanford V Kernel exp.   [XEROX]
 32860   805C        -      -     Stanford V Kernel prod.  [XEROX]
 32861   805D        -      -     Evans & Sutherland       [XEROX]
 32864   8060        -      -     Little Machines          [XEROX]
 32866   8062        -      -     Counterpoint Computers   [XEROX]
 32869   8065        -      -     Univ. of Mass. @ Amherst [XEROX]
 32870   8066        -      -     Univ. of Mass. @ Amherst [XEROX]
 32871   8067        -      -     Veeco Integrated Auto.   [XEROX]
 32872   8068        -      -     General Dynamics         [XEROX]
 32873   8069        -      -     AT&T                     [XEROX]
 32874   806A        -      -     Autophon                 [XEROX]
 32876   806C        -      -     ComDesign                [XEROX]
 32877   806D        -      -     Computgraphic Corp.      [XEROX]
 32878   806E-8077   -      -     Landmark Graphics Corp.  [XEROX]
 32890   807A        -      -     Matra                    [XEROX]
 32891   807B        -      -     Dansk Data Elektronik    [XEROX]
 32892   807C        -      -     Merit Internodal           [HWB]
 32893   807D-807F   -      -     Vitalink Communications  [XEROX]
 32896   8080        -      -     Vitalink TransLAN III    [XEROX]
 32897   8081-8083   -      -     Counterpoint Computers   [XEROX]
 32923   809B        -      -     Appletalk                [XEROX]
 32924   809C-809E   -      -     Datability               [XEROX]
 32927   809F        -      -     Spider Systems Ltd.      [XEROX]
 32931   80A3        -      -     Nixdorf Computers        [XEROX]
 32932   80A4-80B3   -      -     Siemens Gammasonics Inc. [XEROX]
 32960   80C0-80C3   -      -     DCA Data Exchange Cluster[XEROX]
 32964   80C4        -      -     Banyan Systems           [XEROX]
 32965   80C5        -      -     Banyan Systems           [XEROX]
 32966   80C6        -      -     Pacer Software           [XEROX]
 32967   80C7        -      -     Applitek Corporation     [XEROX]
 32968   80C8-80CC   -      -     Intergraph Corporation   [XEROX]
 32973   80CD-80CE   -      -     Harris Corporation       [XEROX]
 32975   80CF-80D2   -      -     Taylor Instrument        [XEROX]
 32979   80D3-80D4   -      -     Rosemount Corporation    [XEROX]
 32981   80D5        -      -     IBM SNA Service on Ether [XEROX]
 32989   80DD        -      -     Varian Associates        [XEROX]
 32990   80DE-80DF   -      -     Integrated Solutions TRFS[XEROX]
 32992   80E0-80E3   -      -     Allen-Bradley            [XEROX]
 32996   80E4-80F0   -      -     Datability               [XEROX]
 33010   80F2        -      -     Retix                    [XEROX]
 33011   80F3        -      -     AppleTalk AARP (Kinetics)[XEROX]
 33012   80F4-80F5   -      -     Kinetics                 [XEROX]
 33015   80F7        -      -     Apollo Computer          [XEROX]
 33023   80FF-8103   -      -     Wellfleet Communications [XEROX]
 33031   8107-8109   -      -     Symbolics Private        [XEROX]
 33072   8130        -      -     Hayes Microcomputers     [XEROX]
 33073   8131        -      -     VG Laboratory Systems    [XEROX]
 33074   8132-8136                Bridge Communications    [XEROX]
 33079   8137-8138   -      -     Novell, Inc.             [XEROX]
 33081   8139-813D   -      -     KTI                      [XEROX]
         8148                     Logicraft                [XEROX]
         8149                     Network Computing Devices[XEROX]
         814A                     Alpha Micro              [XEROX]
 33100   814C        -      -     SNMP                      [JKR1]
         814D                     BIIN                     [XEROX]
         814E                     BIIN                     [XEROX]
         814F                     Technically Elite Concept[XEROX]
         8150                     Rational Corp            [XEROX]
         8151-8153                Qualcomm                 [XEROX]
         815C-815E                Computer Protocol Pty Ltd[XEROX]
         8164-8166                Charles River Data System[XEROX]
         817D-818C                Protocol Engines         [XEROX]
         818D                     Motorola Computer        [XEROX]
         819A-81A3                Qualcomm                 [XEROX]
         81A4                     ARAI Bunkichi            [XEROX]
         81A5-81AE                RAD Network Devices      [XEROX]
         81B7-81B9                Xyplex                   [XEROX]
         81CC-81D5                Apricot Computers        [XEROX]
         81D6-81DD                Artisoft                 [XEROX]
         81E6-81EF                Polygon                  [XEROX]
         81F0-81F2                Comsat Labs              [XEROX]
         81F3-81F5                SAIC                     [XEROX]
         81F6-81F8                VG Analytical            [XEROX]
         8203-8205                Quantum Software         [XEROX]
         8221-8222                Ascom Banking Systems    [XEROX]
         823E-8240                Advanced Encryption Syste[XEROX]
         827F-8282                Athena Programming       [XEROX]
         8263-826A                Charles River Data System[XEROX]
         829A-829B                Inst Ind Info Tech       [XEROX]
         829C-82AB                Taurus Controls          [XEROX]
         82AC-8693                Walker Richer & Quinn    [XEROX]
         8694-869D                Idea Courier             [XEROX]
         869E-86A1                Computer Network Tech    [XEROX]
         86A3-86AC                Gateway Communications   [XEROX]
         86DB                     SECTRA                   [XEROX]
         86DE                     Delta Controls           [XEROX]
 34543   86DF        -      -     ATOMIC                     [JBP]
         86E0-86EF                Landis & Gyr Powers      [XEROX]
         8700-8710                Motorola                 [XEROX]
 34667   876B        -      -     TCP/IP Compression     [RFC1144]
 34668   876C        -      -     IP Autonomous Systems  [RFC1701]
 34669   876D        -      -     Secure Data            [RFC1701]
         8A96-8A97                Invisible Software       [XEROX]
 36864   9000        -      -     Loopback                 [XEROX]
 36865   9001        -      -     3Com(Bridge) XNS Sys Mgmt[XEROX]
 36866   9002        -      -     3Com(Bridge) TCP-IP Sys  [XEROX]
 36867   9003        -      -     3Com(Bridge) loop detect [XEROX]
 65280	 FF00        -      -     BBN VITAL-LanBridge cache[XEROX] 
         FF00-FF0F                ISC Bunker Ramo          [XEROX]
 65535   FFFF        -      -     Reserved               [RFC1701]

The standard for transmission of IP datagrams over Ethernets and
Experimental Ethernets is specified in [RFC894] and [RFC895]
respectively.

NOTE:  Ethernet 48-bit address blocks are assigned by the IEEE.

IEEE Registration Authority
c/o Iris Ringel
IEEE Standards Department
445 Hoes Lane, P.O. Box 1331
Piscataway, NJ 08855-1331
Phone +1 908 562 3813
Fax: +1 908 562 1571


ETHERNET VENDOR ADDRESS COMPONENTS

Ethernet hardware addresses are 48 bits, expressed as 12 hexadecimal
digits (0-9, plus A-F, capitalized).  These 12 hex digits consist of
the first/left 6 digits (which should match the vendor of the Ethernet
interface within the station) and the last/right 6 digits which
specify 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 written
hyphenated by octets (e.g., 12-34-56-78-9A-BC).

These addresses are physical station addresses, not multicast nor
broadcast, so the second hex digit (reading from the left) will be
even, not odd.

At present, it is not clear how the IEEE assigns Ethernet block
addresses.  Whether in blocks of 2**24 or 2**25, and whether
multicasts are assigned with that block or separately.  A portion of
the vendor block address is reportedly assigned serially, with the
other portion intentionally assigned randomly.  If there is a global
algorithm for which addresses are designated to be physical (in a
chipset) versus logical (assigned in software), or globally-assigned
versus locally-assigned addresses, some of the known addresses do not
follow the scheme (e.g., AA0003; 02xxxx).

Another list of Ethernet vendor address components is maitained by
Michael A. Patton and is accessible at:

    <URL:http://www.cavebear.com/CaveBear/ether-codes.html>
    <URL:ftp://ftp.cavebear.com/pub/Ethernet-codes>
    <URL:gopher://ftp.cavebear.com/00/pub/Ethernet-codes>

00000C  Cisco
00000E  Fujitsu
00000F  NeXT
000010  Sytek
00001D  Cabletron
000020  DIAB (Data Intdustrier AB)
000022  Visual Technology
00002A  TRW
000032  GPT Limited (reassigned from GEC Computers Ltd)
00005A  S & Koch
00005E  IANA
000065  Network General
00006B  MIPS
000077  Interphase Corporation
00007A  Ardent
000080  Cray Communications A/S
000089  Cayman Systems  Gatorbox
000093  Proteon
00009F  Ameristar Technology
0000A2  Wellfleet
0000A3  Network Application Technology
0000A6  Network General (internal assignment, not for products)
0000A7  NCD             X-terminals
0000A9  Network Systems
0000AA  Xerox           Xerox machines
0000B3  CIMLinc
0000B7  Dove            Fastnet
0000BC  Allen-Bradley
0000C0  Western Digital
0000C5  Farallon phone net card
0000C6  HP Intelligent Networks Operation (formerly Eon Systems)
0000C8  Altos
0000C9  Emulex          Terminal Servers
0000D7  Dartmouth College (NED Router)
0000D8  3Com? Novell?   PS/2
0000DD  Gould
0000DE  Unigraph
0000E2  Acer Counterpoint
0000EF  Alantec
0000FD  High Level Hardvare (Orion, UK)
000102  BBN             BBN internal usage (not registered)
001700  Kabel
0020AF  3COM ???
0020C9  Victron
008064  Wyse Technology / Link Technologies
00802B  IMAC ???
00802D  Xylogics, Inc.  Annex terminal servers
00808C  Frontier Software Development
0080C2  IEEE 802.1 Committee
0080D3  Shiva
00A03E  ATM Forum
00AA00  Intel
00DD00  Ungermann-Bass
00DD01  Ungermann-Bass
020701  Racal InterLan
020406  BBN             BBN internal usage (not registered)
026086  Satelcom MegaPac (UK)
02608C  3Com            IBM PC; Imagen; Valid; Cisco
02CF1F  CMC             Masscomp; Silicon Graphics; Prime EXL
080002  3Com (Formerly Bridge)
080003  ACC (Advanced Computer Communications)
080005  Symbolics       Symbolics LISP machines
080008  BBN
080009  Hewlett-Packard
08000A  Nestar Systems
08000B  Unisys
080011  Tektronix, Inc.
080014  Excelan         BBN Butterfly, Masscomp, Silicon Graphics
080017  NSC
08001A  Data General
08001B  Data General
08001E  Apollo
080020  Sun             Sun machines
080022  NBI
080025  CDC
080026  Norsk Data (Nord)
080027  PCS Computer Systems GmbH
080028  TI              Explorer
08002B  DEC
08002E  Metaphor
08002F  Prime Computer  Prime 50-Series LHC300
080036  Intergraph      CAE stations
080037  Fujitsu-Xerox
080038  Bull
080039  Spider Systems
080041  DCA Digital Comm. Assoc.
080045  ???? (maybe Xylogics, but they claim not to know this number)
080046  Sony
080047  Sequent
080049  Univation
08004C  Encore
08004E  BICC
080056  Stanford University
080058  ???             DECsystem-20
08005A  IBM
080067  Comdesign
080068  Ridge
080069  Silicon Graphics
08006E  Concurrent      Masscomp
080075  DDE (Danish Data Elektronik A/S)
08007C  Vitalink        TransLAN III
080080  XIOS
080086  Imagen/QMS
080087  Xyplex          terminal servers
080089  Kinetics        AppleTalk-Ethernet interface
08008B  Pyramid
08008D  XyVision        XyVision machines
080090  Retix Inc       Bridges
484453  HDS ???
800010  AT&T            
AA0000  DEC             obsolete
AA0001  DEC             obsolete
AA0002  DEC             obsolete
AA0003  DEC             Global physical address for some DEC machines
AA0004  DEC             Local logical address for systems running 
                        DECNET


ETHERNET MULTICAST ADDRESSES

An Ethernet multicast address consists of the multicast bit, the
23-bit vendor component, and the 24-bit group identifier assigned by
the vendor.  For example, DEC is assigned the vendor component
08-00-2B, so multicast addresses assigned by DEC have the first
24-bits 09-00-2B (since the multicast bit is the low-order bit of the
first byte, which is "the first bit on the wire").

Another list of Ethernet multicast addresses is maitained by Michael
A. Patton and is accessible at:

    <URL:http://www.cavebear.com/CaveBear/ether-codes.html>
    <URL:ftp://ftp.cavebear.com/pub/Ethernet-codes>
    <URL:gopher://ftp.cavebear.com/00/pub/Ethernet-codes>

Ethernet                Type
Address                 Field   Usage

Multicast Addresses:

01-00-5E-00-00-00-      0800    Internet Multicast        [RFC1112]
01-00-5E-7F-FF-FF
01-00-5E-80-00-00-      ????    Internet reserved by IANA
01-00-5E-FF-FF-FF
01-80-C2-00-00-00       -802-   Spanning tree (for bridges)
09-00-02-04-00-01?      8080?   Vitalink printer
09-00-02-04-00-02?      8080?   Vitalink management
09-00-09-00-00-01       8005    HP Probe
09-00-09-00-00-01       -802-   HP Probe
09-00-09-00-00-04       8005?   HP DTC
09-00-1E-00-00-00       8019?   Apollo DOMAIN
09-00-2B-00-00-00       6009?   DEC MUMPS?
09-00-2B-00-00-01       8039?   DEC DSM/DTP?
09-00-2B-00-00-02       803B?   DEC VAXELN?
09-00-2B-00-00-03       8038    DEC Lanbridge Traffic Monitor (LTM)
09-00-2B-00-00-04       ????    DEC MAP End System Hello
09-00-2B-00-00-05       ????    DEC MAP Intermediate System Hello
09-00-2B-00-00-06       803D?   DEC CSMA/CD Encryption?
09-00-2B-00-00-07       8040?   DEC NetBios Emulator?
09-00-2B-00-00-0F       6004    DEC Local Area Transport (LAT)
09-00-2B-00-00-1x       ????    DEC Experimental
09-00-2B-01-00-00       8038    DEC LanBridge Copy packets 
                                (All bridges)
09-00-2B-01-00-01       8038    DEC LanBridge Hello packets 
                                (All local bridges)
                                1 packet per second, sent by the
                                designated LanBridge
09-00-2B-02-00-00       ????    DEC DNA Lev. 2 Routing Layer routers?
09-00-2B-02-01-00       803C?   DEC DNA Naming Service Advertisement?
09-00-2B-02-01-01       803C?   DEC DNA Naming Service Solicitation?
09-00-2B-02-01-02       803E?   DEC DNA Time Service?
09-00-2B-03-xx-xx       ????    DEC default filtering by bridges?
09-00-2B-04-00-00       8041?   DEC Local Area Sys. Transport (LAST)?
09-00-2B-23-00-00       803A?   DEC Argonaut Console?
09-00-4E-00-00-02?      8137?   Novell IPX
09-00-56-00-00-00-      ????    Stanford reserved
09-00-56-FE-FF-FF
09-00-56-FF-00-00-      805C    Stanford V Kernel, version 6.0
09-00-56-FF-FF-FF
09-00-77-00-00-01       ????    Retix spanning tree bridges
09-00-7C-02-00-05       8080?   Vitalink diagnostics
09-00-7C-05-00-01       8080?   Vitalink gateway?
0D-1E-15-BA-DD-06       ????    HP
AB-00-00-01-00-00       6001    DEC Maintenance Operation Protocol 
                                (MOP) Dump/Load Assistance
AB-00-00-02-00-00       6002    DEC Maintenance Operation Protocol 
                                (MOP) Remote Console
                                1 System ID packet every 8-10 minutes,
                                by every:
                                DEC LanBridge
                                DEC DEUNA interface
                                DEC DELUA interface
                                DEC DEQNA interface
                                (in a certain mode)
AB-00-00-03-00-00       6003    DECNET Phase IV end node Hello 
                                packets 1 packet every 15 seconds, 
                                sent by each DECNET host
AB-00-00-04-00-00       6003    DECNET Phase IV Router Hello packets
                                1 packet every 15 seconds, sent by 
                                the DECNET router
AB-00-00-05-00-00       ????    Reserved DEC through
AB-00-03-FF-FF-FF
AB-00-03-00-00-00       6004    DEC Local Area Transport (LAT) - old
AB-00-04-00-xx-xx       ????    Reserved DEC customer private use
AB-00-04-01-xx-yy       6007    DEC Local Area VAX Cluster groups
                                Sys. Communication Architecture (SCA)
CF-00-00-00-00-00       9000    Ethernet Configuration Test protocol 
                                (Loopback)

Broadcast Address:

FF-FF-FF-FF-FF-FF       0600    XNS packets, Hello or gateway search?
                                6 packets every 15 seconds, per XNS 
                                station
FF-FF-FF-FF-FF-FF       0800    IP (e.g. RWHOD via UDP) as needed
FF-FF-FF-FF-FF-FF       0804    CHAOS
FF-FF-FF-FF-FF-FF       0806    ARP (for IP and CHAOS) as needed
FF-FF-FF-FF-FF-FF       0BAD    Banyan
FF-FF-FF-FF-FF-FF       1600    VALID packets, Hello or gateway 
                                search?
                                1 packets every 30 seconds, per VALID 
                                station
FF-FF-FF-FF-FF-FF       8035    Reverse ARP
FF-FF-FF-FF-FF-FF       807C    Merit Internodal (INP)
FF-FF-FF-FF-FF-FF       809B    EtherTalk



IANA ETHERNET ADDRESS BLOCK


The IANA owns an Ethernet address block which may be used for
multicast address asignments or other special purposes.

The address block in IEEE binary is:  0000 0000 0000 0000 0111 1010

In the normal Internet dotted decimal notation this is 0.0.94 since
the bytes are transmitted higher order first and bits within bytes are
transmitted lower order first (see "Data Notation" in the
Introduction).

IEEE CSMA/CD and Token Bus bit transmission order: 00 00 5E

IEEE Token Ring bit transmission order: 00 00 7A

Appearance 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 Bit                         0 = Internet Multicast
                                          1 = Assigned by IANA for
                                              other uses

Appearance 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 Bit         0 = Internet Multicast
                                  1 = Assigned by IANA for other uses

The latter representation corresponds to the Internet standard
bit-order, and is the format that most programmers have to deal with.
Using this representation, the range of Internet Multicast addresses
is:


       01-00-5E-00-00-00  to  01-00-5E-7F-FF-FF  in hex, or

       1.0.94.0.0.0  to  1.0.94.127.255.255  in dotted decimal


SNAP PROTOCOL IDS IN THE IANA ETHERNET ADDRESS BLOCK

The Sub-Network Access Protocol (SNAP) header contains 40 bits: 24
bits containing an IEEE-assigned Organizationally Unique Identifier
(OUI), and 16 bits containing a Protocol Identifier (PID).  The OUIs
are the same as those used in the Ethernet Vendor Address Components
list below.  The IANA's OUI, 00-00-5E, may be used in SNAP headers
with the appropriate PID to identify the protocols listed below.

Note that the IANA restricts this list to protocols that are ONLY
identified in this manner; if a protocol has an EtherType, then SNAP
headers identifying that protocol must contain an OUI of 00-00-00,
with the EtherType in the PID field.

The SNAP PID assignments using the IANA's OUI are:

Protocol ID      Description                     References
-----------      -----------                     ----------
decimal  Hex      
  0001   0001    MARS Data Messages (short form) [work in progress]
  0002   0002    reserved for future NHRP use    [work in progress]
  0003   0003    MARS/NHRP Control Messages      [work in progress]
  0004   0004    MARS Data Messages (long form)  [work in progress]


REFERENCES

[RFC894]  Hornig, C., "A Standard for the Transmission of IP Datagrams
          over Ethernet Networks, STD 41, RFC 894, Symbolics, 
          April 1984.

[RFC895]  Postel, J., "A Standard for the Transmission of IP Datagrams
          over Experimental Ethernet Networks, STD 42, RFC 895, 
          USC/Information Sciences Institute, April 1984.

[RFC1112]  Deeering, S., "Host Extensions for IP Multicasting", 
           STD 5, RFC 1112, Stanford University, August 1989.

[RFC1701]  Hanks, S., Li, T, Farinacci, D., and P. Traina,
           "Generic Routing Encapsulation", RFC 1701, NetSmiths, Ltd.,
           and cisco Systems, October 1994.

PEOPLE

[AXC] Andrew Cherenson <arc@SGI.COM>

[DCP1] David Plummer <DCP@SCRC-QUABBIN.ARPA>

[DT15] Daniel Tappan <Tappan@BBN.COM>

[HWB] Hans-Werner Braun <HWB@MCR.UMICH.EDU>

[JBP] Jon Postel <postel@isi.edu>

[JKR1] Joyce K. Reynolds <jkrey@isi.edu>

[JXM] Joseph Murdock <---none--->

[XEROX] Neil Sembower <sembower@eso.mc.xerox.com>

[]


Connected: An Internet Encyclopedia
Ethernet Numbers

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