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IETF RFC 2928
Initial IPv6 Sub-TLA ID Assignments
Last modified on Thursday, September 28th, 2000
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Network Working Group R. Hinden
Request for Comments: 2928 Nokia
Category: Informational S. Deering
Cisco
R. Fink
LBNL
T. Hain
Microsoft
September 2000
Initial IPv6 Sub-TLA ID Assignments
 Status of this Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Copyright Notice
Copyright © The Internet Society (2000). All Rights Reserved.
Abstract
This document defines initial assignments of IPv6 Sub-Top-Level
Aggregation Identifiers (Sub-TLA ID) to the Address Registries. It
is intended as technical input to the Internet Assigned Numbers
Authority (IANA) from the Internet Engineering Task Force (IETF)
Internet Protocol Next Generation (IPNG) and Next Generation
Transition (NGTRANS) working groups, as an input to the process of
developing guidelines for the allocation of IPv6 addresses.
This document was originally developed to provide advice to IANA in
the fall of 1998 and is being published at this time for the
historical record. The Internet Architecture Board (IAB)
subsequently requested that the IANA delegate these assignments to
the Address Registries. The IANA did this and the Address Registries
are now using them to assign IPv6 addresses.
1. Introduction
This document was originally developed to provide advice to IANA in
the fall of 1998 and is being published at this time for the
historical record. The IAB subsequently requested that the IANA
delegate these assignments to the Address Registries. The IANA did
this and the Address Registries are now using them to assign IPv6
addresses.
Hinden, et al. Informational PAGE 1 
RFC 2928 Initial IPv6 Sub-TLA ID Assignments September 2000
This document defines initial assignments of IPv6 Sub-TLA Aggregation
Identifiers (Sub-TLA ID) to the Address Registries. It is intended
as technical input to the IANA from the IETF IP Next Generation
(IPNG) and Next Generation Transition (NGTRANS) working groups, as an
input to the process of developing guidelines for the allocation of
IPv6 addresses.
The IAB and IESG have authorized the Internet Assigned Numbers
Authority (IANA) as the appropriate entity to have the responsibility
for the management of the IPv6 address space as defined in [ALLOC].
The proposed initial assignment described in the document is
consistent with:
- RFC 2373,"IP Version 6 Addressing Architecture" [ARCH]
- RFC 2374 "An Aggregatable Global Unicast Address Format" [AGGR]
- RFC 2450 "Proposed TLA and NLA Assignment Rules" [TLA-RULES]
2. Background
[TLA-RULES] specifies that TLA assignments will be done in two
stages. The first stage is to allocate a Sub-TLA ID. This document
specifies the initial assignments of Sub-TLA ID's to the Registries.
As defined in [TLA-RULES] Section 5.1:
"Sub-TLA ID's are assigned out of TLA ID 0x0001 as follows. Note
that use of the Reserved field to create the Sub-TLA field is
specific to TLA ID 0x0001. It does not affect any other TLA.
| 3 | 13 | 13 | 19 |
+----+----------+---------+---------------+
| FP | TLA | Sub-TLA | NLA |
| | ID | | ID |
+----+----------+---------+---------------+
where:
FP = 001 = Format Prefix
This is the Format Prefix used to identify aggregatable global
unicast addresses.
TLA ID = 0x0001 = Top-Level Aggregation Identifier
This is the TLA ID assigned by the IANA for Sub-TLA
allocation.
Hinden, et al. Informational PAGE 2
RFC 2928 Initial IPv6 Sub-TLA ID Assignments September 2000
Sub-TLA ID = Sub-TLA Aggregation Identifier
The Sub-TLA ID field is used by the registries for initial
allocations to organizations meeting the requirements in
Section 5.2 of this document. The IANA will assign small
blocks (e.g., few hundred) of Sub-TLA ID's to registries. The
registries will assign the Sub-TLA ID's to organizations
meeting the requirements specified in Section 5.2. When the
registries have assigned all of their Sub-TLA ID's they can
request that the IANA give them another block. The blocks do
not have to be contiguous. The IANA may also assign Sub-TLA
ID's to organizations directly. This includes the temporary
TLA assignment for testing and experimental usage for
activities such as the 6bone or new approaches like exchanges.
NLA ID = Next-Level Aggregation Identifier
Next-Level Aggregation ID's are used by organizations assigned
a TLA ID to create an addressing hierarchy and to identify
sites. The organization can assign the top part of the NLA ID
in a manner to create an addressing hierarchy appropriate to
its network."
Note: In the above quote from [TLA-RULES] the references to "Section
5.2" refer to section 5.2 in [TLA-RULES].
Hinden, et al. Informational PAGE 3
RFC 2928 Initial IPv6 Sub-TLA ID Assignments September 2000
3. Initial Assignments
As specified in [TLA-RULES], Sub-TLA ID assignments are made in
blocks. The initial Sub-TLA ID assignments to IP address registries
are in blocks of 64 Sub-TLA IDs. These assignments are listed below.
Binary Value IPv6 Prefix Range Assignment
---------------- ------------------------------- -------------------
0000 000X XXXX X 2001:0000::/29 - 2001:01F8::/29 IANA
0000 001X XXXX X 2001:0200::/29 - 2001:03F8::/29 APNIC
0000 010X XXXX X 2001:0400::/29 - 2001:05F8::/29 ARIN
0000 011X XXXX X 2001:0600::/29 - 2001:07F8::/29 RIPE NCC
0000 100X XXXX X 2001:0800::/29 - 2001:09F8::/29 (future assignment)
0000 101X XXXX X 2001:0A00::/29 - 2001:0BF8::/29 (future assignment)
0000 110X XXXX X 2001:0C00::/29 - 2001:0DF8::/29 (future assignment)
0000 111X XXXX X 2001:0E00::/29 - 2001:0FF8::/29 (future assignment)
0001 000X XXXX X 2001:1000::/29 - 2001:11F8::/29 (future assignment)
. . .
. . .
. . .
1111 111X XXXX X 2001:FE00::/29 - 2001:FFF8::/29 (future assignment)
Where "X" indicates "0" or "1".
All other Sub-TLA ID values not listed above are reserved.
When a registry has assigned all of the Sub-TLA IDs in their block
they can request that the IANA provide another block. The blocks
assigned to a registry do not have to be contiguous.
The block of Sub-TLA IDs assigned to the IANA (i.e., 2001:0000::/29 -
2001:01F8::/29) is for assignment for testing and experimental usage
to support activities such as the 6bone, and for new approaches like
exchanges.
4. Acknowledgments
The authors would like to express their thanks to Joyce K. Reynolds,
Thomas Narten, Kim Hubbard, Mirjam Kuehne, and Brian Carpenter for
their help with this document.
5. Security Considerations
IPv6 addressing documents do not have any direct impact on Internet
infrastructure security. Authentication of IPv6 packets is defined
in [AUTH]. Authentication of the ownership of prefixes to avoid
"prefix stealing" is a related security issue but is beyond the scope
of this document.
Hinden, et al. Informational PAGE 4
RFC 2928 Initial IPv6 Sub-TLA ID Assignments September 2000
6. References
[AGGR] Hinden, R., Deering, S. and M. O'Dell, "An Aggregatable
Global Unicast Address Format", RFC 2374, July 1998.
[ALLOC] IAB and IESG, "IPv6 Address Allocation Management", RFC
1881, December 1995.
[ARCH] Hinden, R., "IP Version 6 Addressing Architecture", RFC
2373, July 1998.
[AUTH] Kent, S. and R. Atkinson, "IP Authentication Header", RFC
2402, November 1998.
[IPV6] Deering, S. and R. Hinden, "Internet Protocol, Version 6
(IPv6) Specification", RFC 2460, December 1998.
[RFC 2026] Bradner, S., "The Internet Standards Process -- Revision
3", BCP 9, RFC 2026, October 1996.
[TLA-RULES] Hinden, R., "Proposed TLA and NLA Assignment Rules", RFC
2450, December 1998.
[TST-ALLOC] Hinden, R., Fink R. and J. Postel, "IPv6 Testing Address
Allocation", RFC 2471, December 1998.
Hinden, et al. Informational PAGE 5
RFC 2928 Initial IPv6 Sub-TLA ID Assignments September 2000
7. Authors' Addresses
Robert M. Hinden
Nokia
313 Fairchild Drive
Mountain View, CA 94043
USA
Phone: +1 650 625-2004
EMail: hinden@iprg.nokia.com
Stephen E. Deering
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134-1706
USA
Phone: +1 408 527-8213
EMail: deering@cisco.com
Robert L. Fink
Lawrence Berkeley National Lab
1 Cyclotron Rd.
Bldg 50A, Room 3111
Berkeley, CA 94720
USA
Phone: +1 510 486-5692
EMail: rlfink@lbl.gov
Tony Hain
Microsoft
Phone: +1 425 703-6619
EMail: tonyhain@microsoft.com
Hinden, et al. Informational PAGE 6
RFC 2928 Initial IPv6 Sub-TLA ID Assignments September 2000
8. Full Copyright Statement
Copyright © The Internet Society (2000). All Rights Reserved.
This document and translations of it may be copied and furnished to
others, and derivative works that comment on or otherwise explain it
or assist in its implementation may be prepared, copied, published
and distributed, in whole or in part, without restriction of any
kind, provided that the above copyright notice and this paragraph are
included on all such copies and derivative works. However, this
document itself may not be modified in any way, such as by removing
the copyright notice or references to the Internet Society or other
Internet organizations, except as needed for the purpose of
developing Internet standards in which case the procedures for
copyrights defined in the Internet Standards process must be
followed, or as required to translate it into languages other than
English.
The limited permissions granted above are perpetual and will not be
revoked by the Internet Society or its successors or assigns.
This document and the information contained herein is provided on an
"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Acknowledgement
Funding for the RFC Editor function is currently provided by the
Internet Society.
Hinden, et al. Informational PAGE 7
Initial IPv6 Sub-TLA ID Assignments
RFC TOTAL SIZE: 11882 bytes
PUBLICATION DATE: Thursday, September 28th, 2000
LEGAL RIGHTS: The IETF Trust (see BCP 78)
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