[dns-operations] Looking for a public blackhole/sinkhole IP address

Jared Mauch jared at puck.nether.net
Wed Nov 26 14:56:03 UTC 2014

We have such an IP address in our backbone  but don't publish it. I suppose someone could ask for an allocation for this purpose from a local RIR and this could be done for that whole range. 

Jared Mauch

> On Nov 26, 2014, at 9:25 AM, Stephane Bortzmeyer <bortzmeyer at nic.fr> wrote:
> I'm trying to find out if it exists a public IP address which is a
> black hole, swallowing every packet sent to it.
> I can do that on my network but I'm wondering if it already exists
> somewhere, may be as an anycasted service (AS112-style).
> The idea is to delegate some domain names to unresponsive name servers
> (deleting the domain name is less efficient, since the negative TTL is
> smaller than the delegation TTL).
> It must work from everywhere on the Internet. 127/8 does not (the
> packets are not dropped but delivered to the resolver itself when it
> will try to follow the delegation). Same thing for RFC 1918 (there are
> often such addresses in the local network).
> I was thinking of non-routed addresses like or
> but it's not their normal use. AFAIK, there are no
> "public sinkholes" IPv4 addresses. For IPv6, there is 100::/64 but it
> is only internal, there is no public 100::/64 service.
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