% 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 '109.245.72.0 - 109.245.72.255'

% Abuse contact for '109.245.72.0 - 109.245.72.255' is 'net-reg@cetin.rs'

inetnum:        109.245.72.0 - 109.245.72.255
netname:        RS-CETIN-20091223
descr:          CETIN doo Serbia address space for wholesale user KABLOVSKE TELEKOMUNIKACIJE HOME NETWORK ALEKSINAC
country:        RS
remarks:        **************************************************************
remarks:        for ABUSE use golubovicnetwork@gmail.com
remarks:        **************************************************************
org:            ORG-CLB1-RIPE
admin-c:        VS11222-RIPE
tech-c:         VS11222-RIPE
status:         ASSIGNED PA
mnt-by:         mnt-rs-cetin-1
mnt-by:         MNT-TELENORDOO
created:        2023-04-28T08:45:11Z
last-modified:  2023-04-28T08:50:24Z
source:         RIPE

organisation:   ORG-CLB1-RIPE
org-name:       CETIN Ltd. Belgrade
country:        RS
org-type:       LIR
address:        Omladinskih brigada 90
address:        11070
address:        Belgrade
address:        SERBIA
phone:          +381 63 444 222
admin-c:        VS11222-RIPE
tech-c:         VS11222-RIPE
abuse-c:        AR60981-RIPE
mnt-ref:        mnt-rs-cetin-1
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         mnt-rs-cetin-1
created:        2020-09-14T07:32:12Z
last-modified:  2020-12-16T13:29:25Z
source:         RIPE # Filtered

role:           Visnja Simpraga
address:        Omladinskih brigada 90
address:        11070
address:        Belgrade
address:        SERBIA
phone:          +381 63 444 222
nic-hdl:        VS11222-RIPE
mnt-by:         mnt-rs-cetin-1
created:        2020-09-14T07:32:10Z
last-modified:  2020-09-14T07:32:12Z
source:         RIPE # Filtered

% Information related to '109.245.64.0/19AS15958'

route:          109.245.64.0/19
descr:          CETINDOO-APN-NET
descr:          Cetin d.o.o Beograd
origin:         AS15958
remarks:        **************************************************************
remarks:        for ABUSE use abuse!a!cetin.rs
remarks:        **************************************************************
mnt-by:         MNT-TELENORDOO
created:        2009-12-25T21:41:34Z
last-modified:  2023-05-30T09:43:23Z
source:         RIPE # Filtered

% 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