I would suggest to use recent information to file such a mail.

For me it looks like the are relying on stale information collected a long time 
ago.

whoever is hosting this stale information ...

you simply could query the live DNS and the RIPE whois server ...

I agree with Andreas ... they do not carry out professionality.

----- Am 18. Feb 2020 um 9:08 schrieb Silvan M. Gebhardt 
gebha...@openfactory.ch:

> So what I suspect happened is this
> 
> 
> On 2/18/20 1:51 AM, Andreas Fink wrote:
>> 2. The single IP address in the report is not in my network (I used to
>> have that IP range in the past but I sold it in 2016. So long long ago. )
> 
> it might still be registred to you via shadowservers.org OR another org
> like this
> 
>> 3. The abuse email they sent the report to is not in the whois of that
>> network.
> it might be becuase it shows it to belong to you via shadowservers.org
> instead.
>> 4. The DNS name used in the report is not the reverse PTR of that IP.
>> Nor does the forward DNS point to that IP.
>> 5. The DNS name points to a host in my network but that host is
>> definitively not a IoT device which has any kind of default password.
>> Its a solid Linux machine with a up to date distribution with 2
>> usernames only on it with very secure passwords and only one specific
>> application running which doesn't talk to outside my network at all.
>> If that machine would have gotten hacked, it would surprise me very
>> much. At least I have found nothing unusual on that IP. No unexpected
>> network activity, CPU load, processes etc.
> 
> 
> it looks to me like there is something going wrong with
> shadowservers.org and any other report like this. seems they just
> forwarded it without fact checking, which, is kinda not their job either
> (would swamp them massively I guess)
> 
> 
> so yeah, guess you'd have to ask which source the report came from?
> 
> 
> 
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