% 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 '88.153.0.0 - 88.153.127.255'

% Abuse contact for '88.153.0.0 - 88.153.127.255' is 'abuse.de@vodafone.com'

inetnum:        88.153.0.0 - 88.153.127.255
netname:        DE-KNRW-IP4
descr:          Unitymedia
country:        DE
admin-c:        UMAC-RIPE
tech-c:         UMTC-RIPE
status:         ASSIGNED PA
mnt-by:         UNITYMEDIA-MNT
created:        2009-03-09T16:25:30Z
last-modified:  2009-07-13T08:47:26Z
source:         RIPE

role:           Unitymedia Administration
address:        Vodafone West GmbH
address:        Ferdinand-Braun-Platz 1
address:        40549 Düsseldorf
address:        GERMANY
admin-c:        MH3982-RIPE
admin-c:        HZ1532-RIPE
tech-c:         UMTC-RIPE
nic-hdl:        UMAC-RIPE
mnt-by:         UNITYMEDIA-MNT
mnt-by:         KabelBW-MNT
created:        2009-07-10T11:13:10Z
last-modified:  2023-01-12T14:56:28Z
source:         RIPE # Filtered

role:           Unitymedia Technical Contact
address:        Vodafone West GmbH
address:        Ferdinand-Braun-Platz 1
address:        40549 Düsseldorf
address:        GERMANY
admin-c:        UMAC-RIPE
admin-c:        UMAB-RIPE
tech-c:         MH3982-RIPE
tech-c:         HZ1532-RIPE
nic-hdl:        UMTC-RIPE
mnt-by:         UNITYMEDIA-MNT
mnt-by:         KabelBW-MNT
created:        2009-07-10T11:13:10Z
last-modified:  2023-01-12T14:57:31Z
source:         RIPE # Filtered

% Information related to '88.153.0.0/16AS20825'

route:          88.153.0.0/16
descr:          Unitymedia
origin:         AS20825
mnt-by:         UNITYMEDIA-MNT
created:        2010-10-29T19:47:35Z
last-modified:  2010-10-29T19:47:35Z
source:         RIPE

% Information related to '88.153.0.0/16AS3209'

route:          88.153.0.0/16
descr:          Vodafone West
origin:         AS3209
mnt-by:         UNITYMEDIA-MNT
created:        2021-03-08T23:13:49Z
last-modified:  2021-03-08T23:13:49Z
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