Universal Multiple-Octet Coded Character Set (UCS) - ISO/IEC 10646

(a snapshot as of 2003-10-17)

The intention of the roadmaps document is to show a visual layout of the coding space for further allocations of scripts in ISO/IEC 10646 (also in the Unicode Standard). These roadmap layouts are snapshots of scripts and characters that are known as of 2003-10-17 (pre-WG2 meeting no. 44, Mountain View, CA, USA, 2003-10-20/23). This document is intended to be used as general guideline and does not attempt to make detailed allocations of characters.

Table 1 outlines the different planes of ISO/IEC 10646 and their generic contents.

Table 1: Allocations for Planes in ISO 10646
Range of UCS-4 values (Hex)Plane #Name of Plane
00000000 ... 0000FFFFPlane 0 Basic Multilingual Plane - BMP; Encoded in 10646-1: 2000 and its amendments.
00010000 ... 0001FFFFPlane 1 Supplementary Multilingual Plane for scripts and symbols (SMP), encoded in 10646-2: 2001 and its amendments.
00020000 ... 0002FFFFPlane 2 Supplementary Ideographic Plane (SIP) encoded in 10646-2: 2001 and its amendments.
00030000 ... 0003FFFF to
000D0000 ... 000DFFFF
Plane 3 to
Plane 13
Reserved for Future Allocations
000E0000 ... 000EFFFFPlane 14 Supplementary Special-purpose Plane (SSP) encoded in 10646-2: 2001.
000F0000 ... 000FFFFFPlane 15Reserved for Private Use
00100000 ... 0010FFFFPlane 16Reserved for Private Use

The roadmap layouts are maintained by an adhoc group on Roadmaps. This group's latest working document is located at Roadmaps to Unicode. Snapshots from these layouts are submitted for WG2 acceptance for the continued work on ISO/IEC 10646 and is closely coordinated with the work on the Unicode Standard in liaison with the Unicode Consortium.

The latest snapshot of the roadmaps that has been accepted at the last WG2 meeting for the BMP, SMP, SIP and SSP can be found at: (also n2662.htm)

Please note that this roadmap consolidates into a single document information for each of the planes 0, 1, 2 and 14.

The above roadmaps indicate that these three planes should suffice for all future encoding of characters having world-wide utility. In addition,

Note that additional 10 supplementary planes are available for encoding (with an additional 2 planes reserved for private use). Should Plane 2, the SIP (Supplementary Ideographic Plane) prove insufficient for future Han character encoding, it is anticipated that further allocations may be provided on Plane 3.