setting IPv6 address for domain

I am quite new to the server business and I was wondering about a thing with the IPv6 addresses:

When I assign an IPv6 address for my domain as an AAAA record: Do I assign a /64 address or do I assign a complete single address out of the /64 that I got from my provider?

The thing is that I only got a /64 so I divided them somehow amongst my domains, but I get the impression that I am doing this wrong...

Thanks in advance!

Answer

You assign a full address (/128) in a quad-A record. The /64 is a range of addresses for you to allocate from.

For example:

2604:4301:a:103/64 is my range, and I can use any address between 2604:4301:a:103:: (the :: is shorthand for all-zeros) and 2604:4301:a:103:FFFF:FFFF:FFFF:FFFF.