What kind of cryptic letter was sent by the VDS host?

Question

Domain Name System

Tell me, please, what could be the matter?

Hello Networking/Systems Admin,
We have detected abuse from the IP address SERVER IP. See below for how we obtained your email address in case it is wrong. We would appreciate if you would investigate and take action as appropriate.
** THIS IP ADDRESS IS NULL ROUTED on our entire network, including peering and transit, for a period of time not exceeding 24 hours from the date and time of this email. YOU ARE NOT REQUIRED to reply to this email unless you need more information.
You can see more information on this incident by reviewing the data at http://darknet.superb.net/ip/my ip and log lines are given below. Please ask if you require any further information.
You may contact us at [email protected]
(If you are not the correct person to contact about this please accept our apologies - your e-mail address was extracted from the whois record by an automated process. This mail was generated by an automated process.)
The recipient address of this report was provided by the Abuse Contact DB by abusix.com. abusix.com does not maintain the content of the database. All information they provide derives from the RIR databases and is processed for ease of use. If you want to change or report non working abuse contacts please contact the appropriate RIR. If you have any further question, contact abusix.com directly via email ([email protected]). Information about the Abuse Contact Database can be found here:
abusix.com/global-reporting/abuse-contact-db

Answer 1

You have made a null route on the server ip (in fact, they have made it non-routable on the network). Why - it is written under the link.

Answer 2

"You can see more information on this incident by reviewing the data at http://darknet.superb.net/ip/my ip and log lines are given below. Please ask if you require any further information
" reported?