% 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 '91.230.144.0 - 91.230.144.255'

% Abuse contact for '91.230.144.0 - 91.230.144.255' is 'ripe@kajot.cz'

inetnum:        91.230.144.0 - 91.230.144.255
netname:        CZ-KAJOT
country:        CZ
org:            ORG-DS352-RIPE
admin-c:        MK21364-RIPE
tech-c:         MK21364-RIPE
status:         ASSIGNED PI
mnt-by:         cz-kajot-1-mnt
mnt-by:         RIPE-NCC-END-MNT
created:        2020-09-04T08:54:25Z
last-modified:  2020-09-04T08:54:25Z
source:         RIPE

organisation:   ORG-DS352-RIPE
org-name:       Development 777 s.r.o.
country:        CZ
org-type:       LIR
address:        Bednarova 621/29
address:        61900
address:        Brno
address:        CZECH REPUBLIC
phone:          +420515535100
admin-c:        MK21364-RIPE
tech-c:         MK21364-RIPE
abuse-c:        AR45696-RIPE
mnt-ref:        cz-kajot-1-mnt
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         cz-kajot-1-mnt
created:        2018-03-26T05:28:04Z
last-modified:  2020-12-16T13:24:23Z
source:         RIPE # Filtered

person:         Miroslav Minarik
address:        Bednarova 621/29
address:        61900
address:        Brno
address:        CZECH REPUBLIC
phone:          +420515535100
nic-hdl:        MK21364-RIPE
mnt-by:         cz-kajot-1-mnt
created:        2018-03-26T05:28:02Z
last-modified:  2020-08-18T07:30:21Z
source:         RIPE

% Information related to '91.230.144.0/24AS51134'

route:          91.230.144.0/24
descr:          INTACTO-2-PI-MAI-CZ
origin:         AS51134
mnt-by:         MASTER-MNT
created:        2011-07-13T12:29:35Z
last-modified:  2011-07-13T12:29:35Z
source:         RIPE

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

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