To lookup info from Cymru (https://www.team-cymru.org/IP-ASN-mapping.html#dns) the domain needs to be changed. Although I have not personally seen any, there may also be cases where dropping the domain altogether would be helpful.

So I am wondering if the @property should return the 'bare' reversed address and a new function be added to append the version-appropriate domain as the default or an optional arg as a convenience?

Ref: https://bugs.python.org/issue20480