more would be a waste of address spacemy former provider, tweakDSL, offers an ipv6 tunnel to their customers on request, which is set up manually for you by their admin, Friek. however, he will only give a /64. nothing more, not even a /60. Something similar may be done by other home ISP's. giving only a /64 and nothing more is not enough for comfort and unnecessarily restricts your customer.
(Update: i moved back to XS4ALL (primarily for other reasons), which gives me a /48, more than enough for comfort, and it can be set up automatically. thanks for providing quality service;)
| globally routable prefix | customer prefix | subnet prefix | interface address |
| typically up to /32 | typically between /48 and /64 | /64 | 64 bits |
| prefix length | number of allocations within a /32 | number of subnets in allocation | comment |
| /48 | 65,526 | 65,536 | officially recommended for large sites >100 subnets |
| /52 | 1,048,675 | 4,096 | officially recommended for small sites <100 subnets |
| /56 | 16,777,216 | 256 | officially recommended for homes <10 subnets |
| /60 | 268,435,456 | 16 | given out by some ISP's for homes |
| /64 | 4,294,967,296 | 1 | officially recommended only if one subnet is needed |