RFC 4042, "UTF-9 and UTF-18 Efficient Transformation Formats of Unicode", April 2005

Errata ID: 7869
Status: Reported
Type: Technical
Publication Format(s) : TEXT
Reported By: Davide Cavagnino
Date Reported: 2024-03-24

Section 4 says:

the range U+E0000 - U+EFFFF are copied as values 0x30000 - 0x3ffff;
   that is, these values are shifted by 0x70000.

It should say:

the range U+E0000 - U+EFFFF are copied as values 0x30000 - 0x3ffff;
   that is, these values are shifted by 0xB0000.

Notes:

It seems to me that the difference between the original and mapped ranges is 0xB0000

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