Network Working Group G. Huston Request for Comments: 4147 APNIC Category: Informational August 2005 Proposed Changes to the Format of the IANA IPv6 Registry 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 (C) The Internet Society (2005).
AbstractThis document proposes a revised format for the IANA IPv6 address registries. Rather than providing a formal definition of the format, it is described by giving examples of the (current as of preparation of this document) contents of the registries in the proposed format. The proposed format would bring the IANA IPv6 address registries into alignment with the current IPv6 Address Architecture specification, as well as update it to a more useful and generally accepted format. iana-ipv6-registry] [iana-ipv6-tla] are based on a now-deprecated address architecture that used the concept of Top Level Aggregation Identifiers (TLAs) and sub-TLAs. The current IPv6 Address Architecture [RFC3513] uses the terminology of Global Identifiers instead of TLAs and sub-TLAs.
Figure 1. The registry explicitly notes which entity is placing a reservation on an address block and notes the defining RFC document for each allocation. The proposed format of the registry is a title line, the date of the last change to the registry, the registry in a tabular format, notes and references. The table uses 4 columns. Within the table, the first column contains an IPv6 address prefix, using a hexadecimal notation of the address prefix and a prefix length. There are no overlapping address blocks in the first column, and the set of address blocks in the registry spans the entire IPv6 address space. The second column denotes the current disposition of the address block, using notation derived from the defining RFC document. The third column contains a reference to the RFC that describes the current disposition of the address block. The fourth column uses numeric footnote notation to reference any additional text associated with the address block. The notes in the registry may include a summary of previous disposition status values associated with an address block, as this summary is specifically not included in the registry table. The notes are numbered sequentially. The reference section uses a conventional citation format. The references include documents referenced in the registry table and documents referenced in the notes. ----------------------------------------------------- INTERNET PROTOCOL VERSION 6 ADDRESS SPACE [last updated 13 January 2005] IPv6 Prefix Allocation Reference Note ----------- ---------- --------- ---- 0000::/8 Reserved by IETF RFC3513  0100::/8 Reserved by IETF RFC3513 0200::/7 Reserved by IETF RFC4048  0400::/6 Reserved by IETF RFC3513 0800::/5 Reserved by IETF RFC3513 1000::/4 Reserved by IETF RFC3513 2000::/3 Global Unicast RFC3513  4000::/3 Reserved by IETF RFC3513
6000::/3 Reserved by IETF RFC3513 8000::/3 Reserved by IETF RFC3513 A000::/3 Reserved by IETF RFC3513 C000::/3 Reserved by IETF RFC3513 E000::/4 Reserved by IETF RFC3513 F000::/5 Reserved by IETF RFC3513 F800::/6 Reserved by IETF RFC3513 FA00::/7 Reserved by IETF RFC3513 FC00::/7 Reserved by IETF RFC3513 FE00::/9 Reserved by IETF RFC3513 FE80::/10 Link Local Unicast RFC3513 FEC0::/10 Reserved by IETF RFC3879  FF00::/8 Multicast RFC3513 Notes:  The IPv6 address management function was formally delegated to IANA in December 1995 [RFC1881].  The "unspecified address", the "loopback address", and the IPv6 Addresses with Embedded IPv4 Addresses are assigned out of the 0000::/8 address block.  0200::/7 was previously defined as an OSI NSAP-mapped prefix set [RFC1888]. This definition has been deprecated as of December 2004 [RFC4048].  The IPv6 Unicast space encompasses the entire IPv6 address range with the exception of FF00::/8. [RFC3513] IANA unicast address assignments are currently limited to the IPv6 unicast address range of 2000::/3. IANA assignments from this block are registered in the IANA registry: iana-ipv6-unicast- address-assignments.  FEC0::/10 was previously defined as a Site-Local scoped address prefix. This definition has been deprecated as of September 2004 [RFC3879]. References: [RFC1881] The IAB and IESG, "IPv6 Address Allocation Management", RFC 1881, December 1995. [RFC1888] J. Bound et al, "OSI NSAPs and IPv6", RFC 1888, August 1996. [RFC3513] R. Hinden and S. Deering, "IP Version 6 Addressing Architecture", RFC 3513, April 2003.
o A note and a corresponding reference to RFC1881 was added to record the formal delegation of the IPv6 address management function to IANA. Figure 2. The registry notes the current allocations, and does not include any notation of intended future allocations or reservations. All address space not listed in this registry forms the IANA unallocated address pool, to be allocated by IANA as per the prevailing address allocation policies. The proposed format of the registry is a title line, the date of the last change to the registry, the registry in a tabular format, notes and references. The table uses 4 columns. Within the table, the first column is an IPv6 address prefix, using a hexadecimal notation of the address prefix and a prefix length. There are no overlapping address blocks in the first column. The entries here describe only IANA allocations of address blocks. Temporary IANA reservations for future allocations, allocation expansion windows and any other internal IANA states are not described in this registry. The second column describes the current disposition of the address block, by noting either the Regional Internet Registry (RIR) to whom the address block was assigned, or the intended use of the address block. The third column is the date of the IANA allocation, including the day of the month. The fourth column uses numeric footnote notation to reference any additional text associated with the address block. The notes in the registry may include a summary of previous disposition status values associated with an address block, as this summary is specifically not included in the registry table. The notes are numbered sequentially. The reference section uses a conventional citation format. The references include documents referenced in the registry table and documents referenced in the notes.
----------------------------------------------------- IPV6 GLOBAL UNICAST ADDRESS ASSIGNMENTS [last updated 13 January 2005] Global Unicast Prefix Assignment Date Note --------------------- ---------- ------ ---- 2001:0000::/23 IANA 01 Jul 99  2001:0200::/23 APNIC 01 Jul 99 2001:0400::/23 ARIN 01 Jul 99 2001:0600::/23 RIPE NCC 01 Jul 99 2001:0800::/23 RIPE NCC 01 May 02 2001:0A00::/23 RIPE NCC 02 Nov 02 2001:0C00::/23 APNIC 01 May 02  2001:0E00::/23 APNIC 01 Jan 03 2001:1200::/23 LACNIC 01 Nov 02 2001:1400::/23 RIPE NCC 01 Feb 03 2001:1600::/23 RIPE NCC 01 Jul 03 2001:1800::/23 ARIN 01 Apr 03 2001:1A00::/23 RIPE NCC 01 Jan 04 2001:1C00::/22 RIPE NCC 01 May 04 2001:2000::/20 RIPE NCC 01 May 04 2001:3000::/21 RIPE NCC 01 May 04 2001:3800::/22 RIPE NCC 01 May 04 2001:4000::/23 RIPE NCC 11 Jun 04 2001:4200::/23 ARIN 01 Jun 04 2001:4400::/23 APNIC 11 Jun 04 2001:4600::/23 RIPE NCC 17 Aug 04 2001:4800::/23 ARIN 24 Aug 04 2001:4A00::/23 RIPE NCC 15 Oct 04 2001:4C00::/23 RIPE NCC 17 Dec 04 2001:5000::/20 RIPE NCC 10 Sep 04 2001:8000::/19 APNIC 30 Nov 04 2001:A000::/20 APNIC 30 Nov 04 2002::/16 6to4 01 Feb 01  2003:0000::/18 RIPE NCC 12 Jan 05 3FFE::/16 6BONE 01 Dec 98  Notes:  The assignable Global Unicast Address space is defined in [RFC3513] as being the address block defined by the prefix 2000::/3. All address space in this block not listed in the table above is reserved by IANA for future allocation.
 The prefix assigned to the IANA, 2001:0000::/23, is for assignment for testing, experimental and trial usage by IANA [RFC2928].  2001:0DB8::/32 has been assigned as a NON-ROUTABLE range to be used for documentation purposes [RFC3849].  2002::/16 is reserved for use in 6to4 deployments [RFC3056]  3FFE::/16 is an experimental allocation to the 6BONE [RFC2471]. This prefix will be returned to the unassigned address pool on the 6th June 2006 [RFC3701]. References: [RFC2471] R. Hinden, R. Fink and J. Postel, "IPv6 Testing Address Allocation", RFC 2471, December 1998. [RFC2928] R. Hinden, S. Deering, R. Fink and T. Hain, "Initial IPv6 Sub-TLA ID Assignments", RFC 2928, September 2000. [RFC3056] B. Carpenter and K. Moore, "Connection of IPv6 Domains via IPv4 Clouds", RFC 3056, February 2001. [RFC3513] R. Hinden and S. Deering, "Internet Protocol Version 6 (IPv6) Addressing Architecture", RFC 3513, April 2003. [RFC3701] R. Fink and R. Hinden, "6bone (IPv6 Testing Address Allocation) Phaseout", RFC 3701, March 2004. [RFC3849] G. Huston, A. Lord, A and P. Smith, "IPv6 Address Prefix Reserved for Documentation", RFC 3849, July 2004. ----------------------------------------------------- Figure 2
The proposed format for the IANA registry is a small step towards the creation of a registry that can be used as a trust point for commencing a chain of address validation. Consideration should be given to IANA registry publication formats that are machine parseable, and also the use of file signatures and associated certificate mechanisms to allow applications to confirm that the registry contents are current, and that they have been published by the IANA. [RFC3513] Hinden, R. and S. Deering, "Internet Protocol Version 6 (IPv6) Addressing Architecture", RFC 3513, April 2003. [iana-ipv6-registry] IANA, "IANA IPv6 Address Registry", December 2004. [iana-ipv6-tla] IANA, "IANA Registry of IPv6 Top Level Aggregation Identifier Assignments", December 2004. http://www.apnic.net
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