% 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://docs.db.ripe.net/terms-conditions.html

% Note: this output has been filtered.
%       To receive output for a database update, use the "-B" flag.

% Information related to '80.252.144.0 - 80.252.159.255'

% Abuse contact for '80.252.144.0 - 80.252.159.255' is 'abuse@flex.ru'

inetnum:        80.252.144.0 - 80.252.159.255
netname:        FlexNet
descr:          FlexNet customers network
country:        RU
admin-c:        DIFF-RIPE
tech-c:         DIFF-RIPE
status:         ASSIGNED PA
mnt-by:         FLEX-MNT
mnt-lower:      FLEX-MNT
created:        2022-11-29T07:06:14Z
last-modified:  2022-11-29T07:06:14Z
source:         RIPE # Filtered

person:         Alexey V. Morosov
address:        for Flex Ltd
address:        Lenina sq 11
address:        142403 Noginsk, Moscow region
address:        Russian Federation
phone:          +7 495 7029449
fax-no:         +7 495 7029449
nic-hdl:        DIFF-RIPE
mnt-by:         FLEX-MNT
created:        1970-01-01T00:00:00Z
last-modified:  2019-02-28T07:37:56Z
source:         RIPE # Filtered

% Information related to '80.252.128.0/19AS21453'

route:          80.252.128.0/19
descr:          Flex ISP
origin:         AS21453
mnt-by:         FLEX-MNT
created:        2004-09-17T11:33:34Z
last-modified:  2004-09-17T11:33:34Z
source:         RIPE # Filtered

% This query was served by the RIPE Database Query Service version 1.114 (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