% 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 '217.65.198.216 - 217.65.198.219'

% Abuse contact for '217.65.198.216 - 217.65.198.219' is 'net-reg@cetin.rs'

inetnum:        217.65.198.216 - 217.65.198.219
netname:        CETINDOO-NET
descr:          Cetin doo Serbia address space for wholesale user NORDEUS
country:        RS
admin-c:        PRBL45-RIPE
tech-c:         PRBL45-RIPE
tech-c:         NDP113-RIPE
status:         ASSIGNED PA
mnt-by:         MNT-TELENORDOO
created:        2016-06-13T07:53:02Z
last-modified:  2023-05-30T12:57:08Z
source:         RIPE # Filtered

person:         Natasa Dzonlez Papic
address:        Omladinskih brigada 90, 11000 Belgrade, Serbia
phone:          +381 63 9000
nic-hdl:        NDP113-RIPE
mnt-by:         MNT-NDZP999
created:        2018-12-24T11:16:07Z
last-modified:  2018-12-24T11:16:07Z
source:         RIPE

person:         Pedja Radoicic
address:        Omladinskih brigada 90
address:        11070 Novi Beograd, Serbia
phone:          +381 63 9000
nic-hdl:        PRBL45-RIPE
mnt-by:         mnt-prbl45
created:        2012-10-25T07:27:01Z
last-modified:  2012-10-25T07:34:40Z
source:         RIPE

% Information related to '217.65.196.0/22AS15958'

route:          217.65.196.0/22
descr:          Cetin d.o.o Beograd
descr:          Cetin d.o.o
origin:         AS15958
remarks:        **************************************************************
remarks:        for ABUSE use: abuse!a!cetin.rs
remarks:        **************************************************************
mnt-by:         MNT-TELENORDOO
created:        2004-03-28T20:01:35Z
last-modified:  2023-05-30T12:07:14Z
source:         RIPE # Filtered

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

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