Hi Jens, * Opteamax GmbH
as far as I am informed each V6- allocation made by RIPE had always a "reserved" space after the actual allocation which allows "extending" upto /27 ... so returning seems not to be necassary ... at least not as long as /27 is sufficient.
Actually, the reservation is for a /29. That's precisely the reason why the 6RD proposal allowed for extension up to that exact size: «Legacy /32 allocations were allocated with a /29 of “reserved for future expansion” space in mind and can very easily be expanded within that /29. As such, a move from /32 to /29 does not impact negatively RIPE NCC, nor will it lead to discrimination among existing allocations. As the reserved space is already present and would not be allocated to anyone else other than the holder of the /32 already allocated, it seems reasonable to go ahead and let LIRs use the full /29 of space if they need it.» -- https://www.ripe.net/participate/policies/proposals/2011-04 In hindsight, it is a bit of a shame they didn't reserve a /28 instead. That way, 2011-04 could have moved the boundary with a full nibble. Oh well. Tore