Can ipv6 addresses be grouped by prefix?

[bp0]

Since ipv6 addresses change often, could they be grouped by their 64-bit prefix?
So for example, all 2001:db8:abcd:0012::/64, appear as one in the "Visitor Hostname and IP" list?
As it is now, the most common visitor might take up the to 20 spots just by their address changing often.