% 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 '193.58.148.0 - 193.58.149.255'

% Abuse contact for '193.58.148.0 - 193.58.149.255' is 'abuse@kulnet.kuleuven.be'

inetnum:        193.58.148.0 - 193.58.149.255
netname:        UZLEUVEN
country:        BE
org:            ORG-KUL3-RIPE
admin-c:        LVC1-RIPE
tech-c:         LVC1-RIPE
status:         ASSIGNED PI
remarks:        ---------------------------------
remarks:        In case of abuse, please contact:
remarks:        netadmin@uzleuven.be
remarks:        ---------------------------------
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         BELNET-MNT
created:        1970-01-01T00:00:00Z
last-modified:  2016-04-14T08:06:39Z
source:         RIPE

organisation:   ORG-KUL3-RIPE
org-name:       Katholieke Universiteit Leuven
country:        BE
org-type:       LIR
address:        Willem de Croylaan 54 bus 5582
address:        3001
address:        Heverlee
address:        BELGIUM
phone:          +3216322102
fax-no:         +3216322999
admin-c:        HM4023-RIPE
admin-c:        WV789-RIPE
admin-c:        YT711-RIPE
abuse-c:        KLIA1-RIPE
mnt-ref:        RIPE-NCC-HM-MNT
mnt-ref:        KULEUVEN-MNT
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         KULEUVEN-MNT
created:        2012-09-06T09:50:31Z
last-modified:  2020-12-16T13:02:17Z
source:         RIPE # Filtered

person:         L Van Capellen
address:        MS Kliniek
address:        Van Heijlenstraat 16
address:        B-1820 Melsbroek
address:        Belgium
phone:          +32 2 7518030
fax-no:         +32 2 7515245
nic-hdl:        LVC1-RIPE
mnt-by:         BELNET-MNT
created:        1970-01-01T00:00:00Z
last-modified:  2001-09-21T23:49:17Z
source:         RIPE

% Information related to '193.58.148.0/23AS2611'

route:          193.58.148.0/23
origin:         AS2611
mnt-by:         BELNET-MNT
created:        2019-10-25T12:36:46Z
last-modified:  2019-10-25T12:36:46Z
source:         RIPE

% This query was served by the RIPE Database Query Service version 1.112 (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