Confirming Consensus IETF 74

Vint Cerf vint at
Wed Mar 25 13:22:30 CET 2009

Mark Davis has already sent out a brief note outlining a consensus  
reached in the IETF 74 meeting.

In rough terms, the idea is to continue to revise and finalize the  
IDNA2008 documents and to add to them a mapping function for look up  

1. Use the IDNA2008 document set as the base
2. Do NO MAPPING in the registration phase of IDNs
3. Apply an IDNA2003-like mapping function on lookup for compatibility  
with IDNs previously registered under IDNA2003 rules

The WG now needs to specify:

1. what set of characters will be mapped and into what?
2. When will this mapping function be applied

The current protocol spec has an appendix in which a two-lookup method  
is suggested. If an non-mapping look up fails, then the IDNA2003-like  
mapping function would be applied and another look up attempted. there  
are other possible implementations, of course.

This note is to confirm online the consensus reached at IETF74 to move  
along these lines.

WG members and document editors are encouraged to elaborate on this  
proposal and to attempt to reach closure expeditiously.


Vint Cerf
1818 Library Street, Suite 400
Reston, VA 20190
vint at

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