Since when an IPv6 prefix has been announced?

Rafa Sanchez rafa.sgomez at
Mon Apr 9 17:28:39 CEST 2012

Hello list!

Just a simple question.
Does anyone know how could I know when an IPv6 prefix has been announced
for the first time?
For example, since when the following prefix "2001:428:4802:200::/56" has
been announced?

Thanks a lot!
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