Anything more specific than /32 is going to be filtered at some portion of
the ISPs whether for the good or bad. There are some subsets of the v6
address space that have a higher chance of /48 working (for some definition
of 'working') than other parts of the address space, though.
More specific advertisements always stand a chance of being blocked. I was
more interested in whether or not people know of places where they are
actively being blocked and why.
That said- ARIN is handing out /48's- should we be blocking validly
assigned networks?
-Don
