I vaguely remember "celebrating" IPv6 day I believe in 2011 when the last block was assigned from IANA (? - I can never remember which authority does what other

I vaguely remember "celebrating" IPv6 day I believe in 2011 when the last block was assigned from IANA (? - I can never remember which authority does what other than ARIN). Obviously IPv4 addresses can be recycled and NAT and SNI have greatly increased the capacity of a single IP. My company "only" has a pair of /27 blocks which we used to use quite carefully, but now acknowledge will practically never be a limit for our uses.