% 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 '141.23.0.0 - 141.23.255.255'

% No abuse contact registered for 141.23.0.0 - 141.23.255.255

inetnum:        141.23.0.0 - 141.23.255.255
netname:        CSTUB
descr:          Technische Universitaet Berlin, Informatik
descr:          Franklinstr. 28/29
descr:          D-10587 Berlin
country:        DE
admin-c:        TH5476-RIPE
tech-c:         TH5476-RIPE
status:         LEGACY
mnt-by:         DFN-LIR-MNT
mnt-by:         UUNETDE-I
mnt-routes:     DFN-LIR-MNT
mnt-domains:    DFN-HM-MNT
created:        2001-10-09T08:34:35Z
last-modified:  2023-08-30T15:30:24Z
source:         RIPE

role:           tubIT Hostmaster
address:        Technische Universitaet Berlin
address:        Zentraleinrichtung Campusmanagement
address:        Sekretariat EN 50
address:        Einsteinufer 17
address:        10587 Berlin
address:        Germany
phone:          +49 30 314 28800
fax-no:         +49 30 314 21060
nic-hdl:        TH5476-RIPE
mnt-by:         DFN-NTFY
created:        2014-12-11T15:56:45Z
last-modified:  2023-08-30T15:30:24Z
source:         RIPE # Filtered

% Information related to '141.23.0.0/16AS680'

route:          141.23.0.0/16
descr:          CSTUB
origin:         AS680
mnt-by:         DFN-MNT
created:        2010-02-18T12:50:12Z
last-modified:  2010-02-18T12:50:12Z
source:         RIPE

% This query was served by the RIPE Database Query Service version 1.111 (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