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+Network Working Group                                               IANA
+Request for Comments: 1797                                           ISI
+Category: Experimental                                        April 1995
+
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+                       Class A Subnet Experiment
+
+Status of this Memo
+
+   This document defines an Experimental Protocol for the Internet
+   community.  This does not specify an Internet standard of any kind.
+   Discussion and suggestions for improvement are requested.
+   Distribution of this memo is unlimited.
+
+Discussion
+
+   There appears to be some interest in experimenting with subnetting
+   the class A addresses.
+
+   There is some evidence that not all the routing software in use will
+   deal correctly with subnetted class A addresses.  It also appears
+   that actual use of subnetted class A addresses may be necessary in
+   the not too distant future.  It is suggested that conducting an
+   experiment now to identify and fix any software that does not
+   properly handle subnetted class A addresses would be useful and
+   important.
+
+   To further this experiment the IANA will temporarily designate the
+   class A network number 39 to be used in the following way:
+
+   The high order octet of the 4-octet IPv4 address is the class A
+   network number 39.  There are two cases for low order 24 bits.
+
+   Case 1:
+
+      In the first case, the high order bit of these 24 bits is zero and
+      the next 15 bits are the low order 15 bits of a previously
+      assigned Autonomous System number (AS), as registered by a network
+      registry and listed in the RWhois database system.
+
+      Using the AS number in this way allows the experiment to get
+      underway quickly in that it automatically allocates some addresses
+      to each service provider and does not require a registration step.
+
+      One concern is that this might cause a run on AS numbers, since by
+      getting an AS number you automatically get some address space.
+      This concern should be offset by the fact that the amount of
+      address space one gets under this plan is the same as one class C
+
+
+
+IANA                                                            [Page 1]
+
+RFC 1797               Class A Subnet Experiment              April 1995
+
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+      network number (and it should be easier to get a single class C
+      allocated than to get an AS number allocated), and that this is a
+      limited time experiment so that these addresses will be temporary.
+
+      The low order octet of the 4-octet IPv4 address is for local use.
+      It is expected that an address of this form will be used to
+      identify a specific publicly accessible Internet host.
+
+                +--------+-+-------+--------+--------+
+                |   39   |0| low 15 bits AS | local  |
+                +--------+-+-------+--------+--------+
+   Case 2:
+
+      In the second case, the high order bit of these 24 bits is one,
+      and the remaining 23 bits are assigned by the IANA (currently
+      reserved for future use).
+
+                +--------+-+-------+--------+--------+
+                |   39   |1| variable prefix + local |
+                +--------+-+-------+--------+--------+
+
+      The general intent is to find a way to assign to experimenters
+      prefixes of differing lengths so that a variety of experiments can
+      be conducted with the prefix/local-address boundary at different
+      points.
+
+   It is not intended that either of these address allocation schemes is
+   the model for how subnetted class A addresses will be actually
+   allocated in the future.
+
+   It is expected, to make the experiment interesting, that some
+   providers will use these addresses for servers supplying popular
+   material via the Web or FTP.
+
+   For example, if the service provider registered to use AS 690 wished
+   to use this style of address to provide access to a server of popular
+   information on local host 7, the address would be:
+
+                +--------+--------+--------+--------+
+                |   39   |    2   |   178  |    7   |
+                +--------+--------+--------+--------+
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+IANA                                                            [Page 2]
+
+RFC 1797               Class A Subnet Experiment              April 1995
+
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+   The support for DNS name and address resolution should be provided.
+   For example, if Alternet wanted to put up a database of interesting
+   information using the hostname "Interesting.Alter.Net" using the
+   address 39.2.189.7, they would need to put the name to address
+   mapping in their name server using the A record
+
+        Interesting.Alter.Net. IN A 39.2.189.7
+
+   Similarly, the address to name PTR record should be supported
+
+        7.189.2.39.IN-ADDR.ARPA. PTR Interesting.Alter.Net.
+
+   which means that the 189.2.39 branch of the IN-ADDR tree would be
+   delegated to Alternet for the purposes of this experiment.
+
+   To support this, the 39.IN-ADDR.ARPA branch is delegated to the IANA
+   to be managed at ISI.  The nameserver for this branch is
+   IN-ADDR.EP.NET (39.17.199.10).  Participants in this experiment
+   should contact the administrator of this nameserver to have their
+   portion of the address space further delegated.  The administrator
+   for this server can be reached at <aexpreg@isi.edu>.
+
+   Another aspect of the testing that should be performed is to have
+   providers interchange addresses to test the portability of subnetted
+   class A addresses.  It is not intended that this would be the model
+   for actual use.
+
+      For example, if AS 690 and AS 1800 want to try out routing holes
+      in each others' allocations within their AS, that should be
+      encouraged.  That is, suppose AS 690 handed some address of their
+      addresses to AS 1800, and vice-versa.  This type of testing will
+      be necessary to see if the addresses can be made portable in
+      larger sub-A allocations.
+
+   This is experiment will be of limited duration and these addresses
+   may be reassigned to other uses when the experiment is over.
+
+   This experiment will begin on 1-May-95.
+
+   The current date for the termination of this experiment is 1-Dec-95.
+
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+IANA                                                            [Page 3]
+
+RFC 1797               Class A Subnet Experiment              April 1995
+
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+Security Considerations
+
+   Security issues are not discussed in this memo.
+
+Author's Address
+
+   Internet Assigned Numbers Authority (IANA)
+   Information Sciences Institute
+   University of Southern California
+   4676 Admiralty Way, Suite 1001
+   Marina del Rey, CA 90292-6695
+
+   Phone: 1-310-822-1511
+   EMail: iana@isi.edu
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+IANA                                                            [Page 4]
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