% 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 '109.75.144.0 - 109.75.144.255'

% Abuse contact for '109.75.144.0 - 109.75.144.255' is 'abuse@t-mobile.cz'

inetnum:        109.75.144.0 - 109.75.144.255
netname:        VIAGIA-KORUNNI-NET
descr:          VIAGIA KORUNNI
descr:          T-Systems Czech Republic a.s.
descr:          Na Pankraci 1685/19
descr:          Praha 4
descr:          140 21
country:        CZ
admin-c:        HR6606-RIPE
tech-c:         HR6606-RIPE
status:         ASSIGNED PA
mnt-by:         AS13036-MNT
created:        2011-05-03T14:19:06Z
last-modified:  2020-09-10T19:01:47Z
source:         RIPE # Filtered

role:           Hostmaster T-Mobile Czech Republic
address:        T-Mobile Czech Republic a.s.
address:        Tomickova 2144/1
address:        Praha 4
address:        149 00
address:        Czech Republic
admin-c:        LB16056-RIPE
tech-c:         JH5327-RIPE
tech-c:         MD6013-RIPE
tech-c:         LB16056-RIPE
remarks:        --------------------------------------------------
remarks:        In any case of abuse, security or copyright issues
remarks:        please contact:
abuse-mailbox:  abuse@t-mobile.cz
remarks:        --------------------------------------------------
nic-hdl:        HR6606-RIPE
mnt-by:         AS13036-MNT
created:        2002-05-16T17:17:48Z
last-modified:  2024-02-05T09:04:46Z
source:         RIPE # Filtered

% Information related to '109.75.144.0/20AS12767'

route:          109.75.144.0/20
descr:          AS-PRAGONET aggregate
origin:         AS12767
mnt-by:         AS12767-MNT
created:        2009-11-24T10:22:29Z
last-modified:  2021-11-11T08:52:35Z
source:         RIPE

% This query was served by the RIPE Database Query Service version 1.111 (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