rfc790.txt
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Network Working Group J. Postel
Request for Comments: 790 ISI
September 1981
Obsoletes RFCs: 776, 770, 762, 758,
755, 750, 739, 604, 503, 433, 349
Obsoletes IENs: 127, 117, 93
ASSIGNED NUMBERS
This Network Working Group Request for Comments documents the currently
assigned values from several series of numbers used in network protocol
implementations. This RFC will be updated periodically, and in any case
current information can be obtained from Jon Postel. The assignment of
numbers is also handled by Jon. If you are developing a protocol or
application that will require the use of a link, socket, port, protocol,
or network number please contact Jon to receive a number assignment.
Jon Postel
USC - Information Sciences Institute
4676 Admiralty Way
Marina del Rey, California 90291
phone: (213) 822-1511
ARPANET mail: POSTEL@ISIF
Most of the protocols mentioned here are documented in the RFC series of
notes. The more prominent and more generally used are documented in the
Protocol Handbook [17] prepared by the Network Information Center (NIC).
Some of the items listed are undocumented. In all cases the name and
mailbox of the responsible individual is indicated. In the lists that
follow, a bracketed entry, e.g., [17,iii], at the right hand margin of
the page indicates a reference for the listed protocol, where the number
cites the document and the "iii" cites the person.
Postel [Page 1]
RFC 790 September 1981
Assigned Numbers
Network Numbers
ASSIGNED NETWORK NUMBERS
This list of network numbers is used in the internet address [33].
The Internet Protocol (IP) uses a 32 bit address and divides that
address into a network part and a "rest" or local address part. The
division takes 3 forms or classes.
The first type, or class a, of address has a 7-bit network number
and a 24-bit local address. This allows 128 class a networks.
1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0| NETWORK | Local Address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Class A Address
The second type, or class b, of address has a 14-bit network
number and a 16-bit local address. This allows 16,384 class b
networks.
1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|1 0| NETWORK | Local Address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Class B Address
The third type, or class c, of address has a 21-bit network number
and a 8-bit local address. This allows 2,097,152 class c
networks.
1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|1 1 0| NETWORK | Local Address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Class C Address
One notation for internet host addresses commonly used divides the
32-bit address into four 8-bit fields and specifies the value of each
field as a decimal number with the fields separated by periods. For
example, the internet address of ISIF is 010.020.000.052.
This notation will be used in the listing of assigned network
Postel [Page 2]
RFC 790 September 1981
Assigned Numbers
Network Numbers
numbers. The class a networks will have nnn.rrr.rrr.rrr, the class b
networks will have nnn.nnn.rrr.rrr, and the class c networks will
have nnn.nnn.nnn.rrr, where nnn represents part or all of a network
number and rrr represents part or all of a local address or rest
field.
Assigned Network Numbers
Class A Networks
Internet Address Name Network References
---------------- ---- ------- ----------
000.rrr.rrr.rrr Reserved [JBP]
001.rrr.rrr.rrr BBN-PR BBN Packet Radio Network [DCA2]
002.rrr.rrr.rrr SF-PR-1 SF Packet Radio Network (1) [JEM]
003.rrr.rrr.rrr BBN-RCC BBN RCC Network [SGC]
004.rrr.rrr.rrr SATNET Atlantic Satellite Network [DM11]
005.rrr.rrr.rrr SILL-PR Ft. Sill Packet Radio Network[JEM]
006.rrr.rrr.rrr SF-PR-2 SF Packet Radio Network (2) [JEM]
007.rrr.rrr.rrr CHAOS MIT CHAOS Network [MOON]
008.rrr.rrr.rrr CLARKNET SATNET subnet for Clarksburg[DM11]
009.rrr.rrr.rrr BRAGG-PR Ft. Bragg Packet Radio Net [JEM]
010.rrr.rrr.rrr ARPANET ARPANET [17,1,VGC]
011.rrr.rrr.rrr UCLNET University College London [PK]
012.rrr.rrr.rrr CYCLADES CYCLADES [VGC]
013.rrr.rrr.rrr Unassigned [JBP]
014.rrr.rrr.rrr TELENET TELENET [VGC]
015.rrr.rrr.rrr EPSS British Post Office EPSS [PK]
016.rrr.rrr.rrr DATAPAC DATAPAC [VGC]
017.rrr.rrr.rrr TRANSPAC TRANSPAC [VGC]
018.rrr.rrr.rrr LCSNET MIT LCS Network [43,10,DDC2]
019.rrr.rrr.rrr TYMNET TYMNET [VGC]
020.rrr.rrr.rrr DC-PR D.C. Packet Radio Network [VGC]
021.rrr.rrr.rrr EDN DCEC EDN [EC5]
022.rrr.rrr.rrr DIALNET DIALNET [26,16,MRC]
023.rrr.rrr.rrr MITRE MITRE Cablenet [44,APS]
024.rrr.rrr.rrr BBN-LOCAL BBN Local Network [SGC]
025.rrr.rrr.rrr RSRE-PPSN RSRE / PPSN [BD2]
026.rrr.rrr.rrr AUTODIN-II AUTODIN II [EC5]
027.rrr.rrr.rrr NOSC-LCCN NOSC / LCCN [KTP]
028.rrr.rrr.rrr WIDEBAND Wide Band Satellite Network [CJW2]
029.rrr.rrr.rrr DCN-COMSAT COMSAT Dist. Comp. Network [DLM1]
030.rrr.rrr.rrr DCN-UCL UCL Dist. Comp. Network [PK]
031.rrr.rrr.rrr BBN-SAT-TEST BBN SATNET Test Network [DM11]
032.rrr.rrr.rrr UCL-CR1 UCL Cambridge Ring 1 [PK]
033.rrr.rrr.rrr UCL-CR2 UCL Cambridge Ring 2 [PK]
034.rrr.rrr.rrr MATNET Mobile Access Terminal Net [DM11]
035.rrr.rrr.rrr NULL UCL/RSRE Null Network [BD2]
Postel [Page 3]
RFC 790 September 1981
Assigned Numbers
Network Numbers
036.rrr.rrr.rrr SU-NET Stanford University Ethernet [MRC]
037.rrr.rrr.rrr DECNET Digital Equipment Network [DRL]
038.rrr.rrr.rrr DECNET-TEST Test Digital Equipment Net [DRL]
039.rrr.rrr.rrr SRINET SRI Local Network [GEOF]
040.rrr.rrr.rrr CISLNET CISL Multics Network [CH2]
041.rrr.rrr.rrr BBN-LN-TEST BBN Local Network Testbed [KTP]
042.rrr.rrr.rrr S1NET LLL-S1-NET [EAK]
043.rrr.rrr.rrr INTELPOST COMSAT INTELPOST [DLM1]
044.rrr.rrr.rrr AMPRNET Amature Radio Experiment Net [HM]
044.rrr.rrr.rrr-126.rrr.rrr.rrr Unassigned [JBP]
127.rrr.rrr.rrr Reserved [JBP]
Class B Networks
Internet Address Name Network References
---------------- ---- ------- ----------
128.000.rrr.rrr Reserved [JBP]
128.001.rrr.rrr-128.254.rrr.rrr Unassigned [JBP]
191.255.rrr.rrr Reserved [JBP]
Class C Networks
Internet Address Name Network References
---------------- ---- ------- ----------
192.000.001.rrr Reserved [JBP]
192.000.001.rrr-223.255.254.rrr Unassigned [JBP]
223.255.255.rrr Reserved [JBP]
Other Reserved Internet Addresses
Internet Address Name Network References
---------------- ---- ------- ----------
224.000.000.000-255.255.255.255 Reserved [JBP]
Postel [Page 4]
RFC 790 September 1981
Assigned Numbers
Internet Version Numbers
ASSIGNED INTERNET VERSION NUMBERS
In the Internet Protocol (IP) [33] there is a field to identify the
version of the internetwork general protocol. This field is 4 bits
in size.
Assigned Internet Version Numbers
Decimal Octal Version References
------- ----- ------- ----------
0 0 Reserved [JBP]
1-3 1-3 Unassigned [JBP]
4 4 Internet Protocol [33,JBP]
5 5 ST Datagram Mode [20,JWF]
6-14 6-16 Unassigned [JBP]
15 17 Reserved [JBP]
Postel [Page 5]
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