% 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 '89.250.247.0 - 89.250.247.255'

% Abuse contact for '89.250.247.0 - 89.250.247.255' is 'sos@sitel.cz'

inetnum:        89.250.247.0 - 89.250.247.255
netname:        SAIDLM
descr:          Martin Saidl
descr:          Prague 10
country:        CZ
admin-c:        MS4785-RIPE
tech-c:         MS4785-RIPE
status:         ASSIGNED PA
mnt-by:         TRESTEL-CZ-MNT
created:        2006-11-07T12:46:39Z
last-modified:  2006-11-07T12:46:39Z
source:         RIPE # Filtered

person:         Martin Saidl
address:        Mexicka 691/3
address:        Prague 10
address:        10100
address:        The Czech Republic
phone:          +420606845798
nic-hdl:        MS4785-RIPE
mnt-by:         SAIDLM-MNT
created:        2002-11-08T10:49:35Z
last-modified:  2010-05-11T14:21:42Z
source:         RIPE # Filtered

% Information related to '89.250.240.0/20AS41453'

route:          89.250.240.0/20
descr:          TRESTEL-CZ-NET
origin:         AS41453
mnt-by:         TRESTEL-CZ-MNT
mnt-routes:     TRESTEL-CZ-MNT
org:            ORG-SSSR7-RIPE
created:        2006-09-18T18:40:58Z
last-modified:  2019-04-09T10:38:05Z
source:         RIPE

organisation:   ORG-SSSR7-RIPE
org-name:       SITEL spol. s r.o.
country:        CZ
org-type:       LIR
address:        Baarova 957/15
address:        140 00
address:        Prague 4
address:        CZECH REPUBLIC
phone:          +420 267 198 111
admin-c:        SN6040-RIPE
tech-c:         SN6040-RIPE
abuse-c:        AR36121-RIPE
mnt-ref:        RIPE-NCC-HM-MNT
mnt-ref:        cz-sitel-1-mnt
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         cz-sitel-1-mnt
created:        2016-04-18T13:10:17Z
last-modified:  2023-01-06T13:28:24Z
source:         RIPE # Filtered

% 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