IPv6 prefixes in ACLs

[Robert Moskowitz]

Should I put a single entry for my /48 allocation or 16 /64 entries for 
the nets I am currently using?

Does it make any difference for performance?  Any other concerns? The 
192.168 nets I use I have a /24 specified though typically I am only 
using the lower /26.

In theory, no one out there can 'take over' my unused space without 
action by my ISP (which some time in the future if they start running 
out of IPv6 prefixes for their customers they might ask for some back).

Oh, and examples I am finding for specific addresses show v4 addresses 
plain like:

127.0.0.1;  10.5.4.5;

But with a /128 'prefix' for v6 addresses:

::1/128 ; 2001:0db8:100::4/128;

Is what you do for specific addresses?