% 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 '91.239.32.0 - 91.239.33.255'

% Abuse contact for '91.239.32.0 - 91.239.33.255' is 'abuse@korton.nl'

inetnum:        91.239.32.0 - 91.239.33.255
netname:        KORTON_INTERNET
country:        NL
org:            ORG-KIB4-RIPE
admin-c:        BT2443-RIPE
tech-c:         JS19894-RIPE
status:         ASSIGNED PI
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         KORTON-MNT
mnt-routes:     KORTON-MNT
mnt-domains:    KORTON-MNT
created:        2012-05-11T08:11:42Z
last-modified:  2022-02-15T09:11:34Z
source:         RIPE # Filtered

organisation:   ORG-KIB4-RIPE
org-name:       Korton Computer Communication (KCC) B.V.
country:        NL
org-type:       LIR
address:        Pondweg 1
address:        2153PK
address:        Nieuw-Vennep
address:        NETHERLANDS
phone:          +31235555060
fax-no:         +31235555065
abuse-c:        AR16215-RIPE
mnt-ref:        KORTON-MNT
mnt-ref:        RIPE-NCC-HM-MNT
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         KORTON-MNT
created:        2013-10-23T07:59:39Z
last-modified:  2023-11-10T08:29:34Z
source:         RIPE # Filtered

person:         Bastiaan Topper
address:        Jadelaan 99-103
address:        2132 XZ Hoofddorp
address:        The Netherlands
phone:          +31 20 5555060
nic-hdl:        BT2443-RIPE
mnt-by:         KORTON-MNT
created:        2012-05-03T13:09:39Z
last-modified:  2017-10-26T15:04:24Z
source:         RIPE # Filtered

person:         Jorgo Schmitz
address:        Jadelaan 99-103
address:        2132XZ Hoofddorp
address:        The Netherlands
phone:          +31 23 5555060
nic-hdl:        JS19894-RIPE
mnt-by:         KORTON-MNT
created:        2017-10-26T15:04:48Z
last-modified:  2017-10-26T15:04:48Z
source:         RIPE # Filtered

% Information related to '91.239.32.0/23AS58138'

route:          91.239.32.0/23
descr:          Korton Internet B.V.
origin:         AS58138
mnt-lower:      KORTON-MNT
mnt-routes:     KORTON-MNT
mnt-by:         KORTON-MNT
created:        2012-05-11T14:52:11Z
last-modified:  2014-04-04T08:29:25Z
source:         RIPE

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