% APNIC found the following authoritative answer from: whois.ripe.net

% This is the RIPE Database query service.
% The objects are in RPSL format.
%
% The RIPE Database is subject to Terms and Conditions.
% See https://docs.db.ripe.net/terms-conditions.html

% Note: this output has been filtered.
%       To receive output for a database update, use the "-B" flag.

% Information related to '145.228.61.0 - 145.228.61.255'

% Abuse contact for '145.228.61.0 - 145.228.61.255' is 'abuse-ripe@bertelsmann.de'

inetnum:        145.228.61.0 - 145.228.61.255
netname:        ARVATO-CUSTOMER-DEDICATED
org:            ORG-ASG20-RIPE
country:        DE
admin-c:        ASAC11-RIPE
tech-c:         ASTC2-RIPE
status:         ASSIGNED PA
mnt-by:         arvato-systems-MNT
created:        2017-12-11T14:11:39Z
last-modified:  2018-02-13T12:03:15Z
source:         RIPE

organisation:   ORG-ASG20-RIPE
org-name:       Arvato Systems GmbH
org-type:       OTHER
address:        Reinhard-Mohn-Straße 200
address:        33333 Gütersloh
address:        Germany
mnt-ref:        arvato-systems-MNT
mnt-by:         arvato-systems-MNT
created:        2017-01-17T08:28:49Z
last-modified:  2021-08-18T12:38:22Z
source:         RIPE # Filtered

role:           Arvato Systems Admin Contact
address:        Arvato Systems GmbH
address:        Reinhard-Mohn-Straße 200
address:        33333 Guetersloh
address:        Germany
phone:          +49 5241 80 3081
admin-c:        ASRT2-RIPE
abuse-mailbox:  abuse-ripe@bertelsmann.de
nic-hdl:        ASAC11-RIPE
mnt-by:         arvato-systems-MNT
created:        2016-10-14T14:02:14Z
last-modified:  2021-07-14T09:19:43Z
source:         RIPE # Filtered

role:           Arvato Systems Technical Contact
address:        Arvato Systems GmbH
address:        Reinhard-Mohn-Straße 200
address:        33333 Guetersloh
address:        Germany
phone:          +49 5241 80 3081
tech-c:         ASRT2-RIPE
abuse-mailbox:  abuse-ripe@bertelsmann.de
nic-hdl:        ASTC2-RIPE
mnt-by:         arvato-systems-MNT
created:        2016-10-14T14:07:34Z
last-modified:  2021-07-14T09:20:04Z
source:         RIPE # Filtered

% Information related to '145.228.0.0/17AS33873'

route:          145.228.0.0/17
remarks:        netname DE-BAG-BMS-20141120
descr:          arvato-systems-NET
descr:          arvato systems GmbH
descr:          Reinhard-Mohn-Straße 200
descr:          33333 Guetersloh
descr:          Germany
origin:         AS33873
mnt-by:         arvato-systems-MNT
created:        2019-06-12T06:49:49Z
last-modified:  2021-07-14T09:19:08Z
source:         RIPE

% This query was served by the RIPE Database Query Service version 1.114 (DEXTER)

Search for
IP address lookups			Miscellaneous queries
-l	1st level less specific		-i	Inverse attributes	None admin-c admin-c,tech-c,zone-c author cross-mnt cross-nfy local-as mbrs-by-ref member-of mnt-by mnt-lower mnt-nfy mnt-routes notify nserver origin person referral-by rev-srv sub-dom tech-c upd-to zone-c
-L	All less specific		-T	Object types	All as-block as-set aut-num domain filter-set inet-rtr inet6num inetnum irt key-cert mntner peering-set person role route route-set rtr-set
-m	1st level more specific
-M	All more specific		Query hints Include "AS" in front of an AS number. Example: AS4808 Include "-t" (template only) or "-v" (template and description) in front of an object name to view the template Example: -t inetnum
-x	Exact match only
-d	Associated reverse domain