% 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://apps.db.ripe.net/docs/HTML-Terms-And-Conditions

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

% Information related to '81.169.128.0 - 81.169.255.255'

% Abuse contact for '81.169.128.0 - 81.169.255.255' is 'abuse@strato.de'

inetnum:        81.169.128.0 - 81.169.255.255
netname:        DE-TECT-20030417
country:        DE
org:            ORG-SRA1-RIPE
admin-c:        SH15342-RIPE
tech-c:         SH15342-RIPE
status:         ALLOCATED PA
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         STRATO-RZG-MNT
mnt-lower:      STRATO-RZG-MNT
mnt-routes:     STRATO-RZG-MNT
created:        2003-04-17T07:42:20Z
last-modified:  2023-08-25T12:59:13Z
source:         RIPE
tech-c:         SP20660-RIPE
admin-c:        SP20660-RIPE

organisation:   ORG-SRA1-RIPE
org-name:       Strato AG
country:        DE
org-type:       LIR
address:        Otto-Ostrowski-Straße 7
address:        10249
address:        Berlin
address:        GERMANY
phone:          +4972191374551
admin-c:        SP20660-RIPE
abuse-c:        SRAC-RIPE
mnt-ref:        RIPE-NCC-HM-MNT
mnt-ref:        STRATO-RZG-MNT
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         STRATO-RZG-MNT
created:        2004-04-17T11:12:39Z
last-modified:  2023-06-14T08:03:06Z
source:         RIPE # Filtered
admin-c:        SH15342-RIPE
tech-c:         SH15342-RIPE
tech-c:         SP20660-RIPE

person:         Sebastian Hohwieler
address:        IONOS SE
address:        Hinterm Hauptbahnhof 5
address:        D-76137 Karlsruhe
address:        Germany
phone:          +49 721 91374 1876
nic-hdl:        SH15342-RIPE
mnt-by:         AS8560-MNT
created:        2020-11-27T12:37:55Z
last-modified:  2024-01-02T08:19:24Z
source:         RIPE # Filtered
mnt-ref:        AS8560-MNT

person:         Stefan Plug
address:        Otto-Ostrowski-Straße 7
address:        D-10249
address:        Berlin
phone:          +49 151 62361432
nic-hdl:        SP20660-RIPE
mnt-by:         STRATO-RZG-MNT
created:        2022-11-25T14:33:18Z
last-modified:  2022-11-25T14:33:35Z
source:         RIPE

% Information related to '81.169.128.0/17AS6724'

route:          81.169.128.0/17
descr:          STRATO AG
origin:         AS6724
mnt-by:         STRATO-RZG-MNT
created:        2010-08-03T15:00:56Z
last-modified:  2010-09-13T07:57:39Z
source:         RIPE

% This query was served by the RIPE Database Query Service version 1.113.2 (SHETLAND)

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