...

It is applicable for institution or even person using E.164 telephone number and willing to provide such translation.

Prerequisites (OS, dependencies on other software)

• DNS server with NAPTR support (i.e. current BIND9).
• Enum domain which is constructed as reversed telephone number +123456 -> 6.5.4.3.2.1.suffix.

Suffixes

e164.arpa - Public User Enum tree

...