Hello, when i have IPv6 for my server: 2001:41d0:2:2f6f::/64
How can i know which IPv6 i can assign to virtual servers inside this server?

Is there any online tool or manager hich help to show IPs in this subnet, in my range?

Here is quite good IPv6 calculator: http://www.ipv6calculator.net/

My datacenter answered the question what are my IPv6 addresses so im sharing there more people can know.

My example IP:
2001:38d0:2:8f3f:0000:0000:0000:0000 - first ipv6
2001:38d0:2:8f3f:0000:0000:0000:0001 - second ipv6
2001:38d0:2:8f3f:0000:0000:0000:0002 - third ipv6
2001:38d0:2:8f3f:ffff:ffff:ffff:ffff - last ipv6

But im still unsure on how to determine out of IPv6 2001:41d0:2:2f6f::/64 what the first and last IP is?

UPDATE: this calculator can be used to output range.
and this one reports also next IPv6 usefull info (like first/last usable, broadcast ipv6, gateway ipv6

For example if u need to assign IPv6 to a VPS from your range, you start wherewer you want, i left first IP as gateway, you can start from 5th IP for example, here is how it can look like: