% 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 '87.123.0.0 - 87.123.211.255'

% Abuse contact for '87.123.0.0 - 87.123.211.255' is 'abuse@1und1.net'

inetnum:        87.123.0.0 - 87.123.211.255
netname:        VT-CUSTOMER
country:        DE
admin-c:        VTH-RIPE
tech-c:         VTH-RIPE
status:         ASSIGNED PA
org:            ORG-KG4-RIPE
mnt-by:         VT-MNT
mnt-by:         VT-ENGI-MNT
created:        2021-01-12T13:59:01Z
last-modified:  2021-01-12T13:59:01Z
source:         RIPE

organisation:   ORG-KG4-RIPE
org-name:       1&1 Versatel Deutschland GmbH
country:        DE
org-type:       LIR
address:        Wanheimer Straße 90
address:        40468
address:        Duesseldorf
address:        GERMANY
phone:          +49201 8633 145
admin-c:        SP15435-RIPE
admin-c:        OS1997-RIPE
admin-c:        VTH-RIPE
admin-c:        HS7606-RIPE
admin-c:        TK1586-RIPE
admin-c:        BS4675-RIPE
admin-c:        FF9999-RIPE
admin-c:        MD26813-RIPE
abuse-c:        VTH-RIPE
mnt-ref:        RIPE-NCC-HM-MNT
mnt-ref:        VT-ENGI-MNT
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         VT-ENGI-MNT
created:        2004-04-17T11:09:29Z
last-modified:  2023-12-13T14:17:32Z
source:         RIPE # Filtered

role:           Versatel Hostmaster
remarks:        Internet Engineering
address:        Versatel West GmbH
address:        Unterste-Wilms-Strasse 29
address:        44143 Dortmund
address:        Germany
phone:          +49 (0) 231 399 0
abuse-mailbox:  abuse@1und1.net
admin-c:        OS1997-RIPE
admin-c:        TK1586-RIPE
admin-c:        BS4675-RIPE
admin-c:        FF9999-RIPE
admin-c:        SP15435-RIPE
admin-c:        MD26813-RIPE
tech-c:         TK1586-RIPE
tech-c:         BS4675-RIPE
tech-c:         FF9999-RIPE
tech-c:         SP15435-RIPE
tech-c:         MD26813-RIPE
nic-hdl:        VTH-RIPE
mnt-by:         VT-ENGI-MNT
created:        2004-05-19T12:48:36Z
last-modified:  2022-09-19T07:15:33Z
source:         RIPE # Filtered

% Information related to '87.123.0.0/19AS8881'

route:          87.123.0.0/19
origin:         AS8881
descr:          VT-DYNAMICPOOL Nord
mnt-by:         VT-MNT
created:        2022-12-06T13:45:53Z
last-modified:  2022-12-06T13:45:53Z
source:         RIPE

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

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