instant domain name for ipv6 device

https://ungleich.ch/u/blog/has-a-name-for-every-ipv6-address/

TL;DR

You can use IPv6address.has-a.name as a domain name for any of your computers, containers or VMs. The required format is 1234-5678-9abc-def0-1234-5678-9abc-def0.has-a.name. This is already a valid name and points to the IPv6 address 1234:5678:9abc:def0:1234:5678:9abc:def0. Alternatively you can also use the domain has-aaaa.name, which implies IPv6 stronger.

Both domains support IPv6 abbreviation using dashes, you can f.i. use 2a0a-e5c0–3.has-aaaa.name.