I filed a ticket for a /48 and their support set it up for me. I didn't use it heavily but it worked very well; I basically made my own personal tunnel broker.

I filed a ticket for a /48 and their support set it up for me. I didn't use it heavily but it worked very well; I basically made my own personal tunnel broker. :) A /56 still gives you (64-56)^2 = 64 /64's, and I wouldn't think you'd want to run more than 64 tunnels through one box anyway.