IDNA 2008 Question Re: "Confusable" Characters in Domain Names

Vint Cerf vint at
Wed Nov 3 18:58:00 CET 2010

   If your browser is operating under purely idna2008 rules the lookup
should fail. But some implementations may permit the lookup without verfying
the legality of the characters in the lookup string. V

 *From*: idna-update-bounces at <
idna-update-bounces at>
*To*: idna-update at <idna-update at>
*Sent*: Wed Nov 03 13:14:55 2010
*Subject*: IDNA 2008 Question Re: "Confusable" Characters in Domain Names

Dear List Members,

I am a little unclear what impact the IDNA 2008 policy will have on
domain name registrant's who have a domain that does not fall under
the policy's permissible code-points, particularly symbol-based domain

The IDNA 2008 protocol clearly explains what code point are permissible,
but what (in practice) will it mean if someone types in e.g. €.com in their
browser under IDNA 2008?

I do realise that an error message may be displayed, but will IDNA 2008
allow the domain name registrant to satisfy the user's query by forwarding
them on to a different (legal) domain name?

I will hope to hear any replies on this matter.


John Daw
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