% 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 '91.189.72.0 - 91.189.79.255'

% Abuse contact for '91.189.72.0 - 91.189.79.255' is 'e-plan@e-plan.pl'

inetnum:        91.189.72.0 - 91.189.79.255
netname:        PL-SPEED-SOFT
country:        PL
org:            ORG-SAP1-RIPE
admin-c:        AP3427-RIPE
tech-c:         AP3427-RIPE
status:         ASSIGNED PI
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         AS29665-MNT
mnt-routes:     AS29665-MNT
mnt-routes:     ATMAN-MNT
mnt-domains:    AS29665-MNT
mnt-domains:    ATMAN-MNT
created:        2007-01-15T13:36:50Z
last-modified:  2023-03-30T08:42:57Z
source:         RIPE
sponsoring-org: ORG-AS25-RIPE

organisation:   ORG-SAP1-RIPE
org-name:       E-Plan Sp. z o.o.
country:        PL
org-type:       OTHER
address:        ul. Henryka Raabego 2B/94
address:        02-793 Warszawa
phone:          +48 22 2130650
fax-no:         +48 22 2130667
admin-c:        AP3427-RIPE
tech-c:         AP3427-RIPE
abuse-c:        AR21545-RIPE
mnt-ref:        ATMAN-MNT
mnt-by:         ATMAN-MNT
created:        2007-01-09T08:48:35Z
last-modified:  2022-12-01T16:46:38Z
source:         RIPE # Filtered

person:         ANDRZEJ POMESNY
address:        SPEED SOFT ANDRZEJ POMESNY
address:        AL. KOMISJI EDUKACJI NARODOWEJ 54
address:        WARSZAWA
address:        POLAND
phone:          +48 (22) 448 50 65
fax-no:         +48 (22) 448 50 65
nic-hdl:        AP3427-RIPE
mnt-by:         AS29665-MNT
created:        2004-01-21T10:12:07Z
last-modified:  2010-12-15T08:28:48Z
source:         RIPE

% Information related to '91.189.72.0/21AS29665'

route:          91.189.72.0/21
descr:          E-Plan
origin:         AS29665
mnt-by:         AS29665-MNT
mnt-by:         ATMAN-MNT
created:        2007-01-16T15:09:26Z
last-modified:  2015-08-07T12:38:40Z
source:         RIPE

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