0-main.de

We own the DENIC domain 0-main.de. Our promise to you is that any A or AAAA record will always point to 127.0.0.1.

Zonefile

Here’s the Zonefile of the domain. As you can see, we simply point the host record (@) and any record (*) to the loopback interface.

$ORIGIN 0-main.de.
$TTL 43200
; SOA Records
@		IN	SOA	hydrogen.ns.hetzner.com. dns.hetzner.com. 2022011400 86400 10800 3600000 3600
; NS Records
@		IN	NS	helium.ns.hetzner.de.
@		IN	NS	hydrogen.ns.hetzner.com.
@		IN	NS	oxygen.ns.hetzner.com.
; A Records
*		IN	A	127.0.0.1
@		IN	A	127.0.0.1
; AAAA Records
*		IN	AAAA	::1
@		IN	AAAA	::1

Verification

Feel free to dig around (pun intended 😁), e.g.

$ dig +short A 0-main.de
127.0.0.1
$ dig +short A foo.0-main.de
127.0.0.1
$ dig +short A foo.bar.0-main.de
127.0.0.1

$ dig +short AAAA 0-main.de
::1
$ dig +short AAAA foo.0-main.de
::1
$ dig +short AAAA foo.bar.0-main.de
::1

Caveats

Please note that some network setups do not support this style of pointing a domain to 127.0.0.1.

The AVM FRITZ!Box for example does not allow resolving to „domain names that point to private IP addresses“ (via AVM knowledge base).

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