% 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 '5.18.0.0 - 5.18.255.255'

% Abuse contact for '5.18.0.0 - 5.18.255.255' is 'abuse@domru.ru'

inetnum:        5.18.0.0 - 5.18.255.255
netname:        INTERZET-NET2
descr:          Z-Telecom Network
country:        RU
admin-c:        RAID1-RIPE
tech-c:         RAID1-RIPE
status:         ASSIGNED PA
mnt-by:         RAID-MNT
created:        2012-04-27T10:10:40Z
last-modified:  2019-05-20T07:16:01Z
source:         RIPE # Filtered

role:           ER-Telecom ISP Contact Role
address:        JSC "ER-Telecom"
address:        111, str. Shosse Kosmonavtov
address:        614000 Perm
address:        Russian Federation
phone:          +7 342 2462233
fax-no:         +7 342 2463344
abuse-mailbox:  abuse@domru.ru
remarks:        24/7 phone number: +7-342-2362233
admin-c:        AAS585-RIPE
admin-c:        SAWJ-RIPE
tech-c:         AAS585-RIPE
tech-c:         SAWJ-RIPE
nic-hdl:        RAID1-RIPE
mnt-by:         RAID-MNT
created:        2005-02-11T12:50:50Z
last-modified:  2024-07-24T09:39:40Z
source:         RIPE # Filtered

% Information related to '5.18.236.0/22AS41733'

route:          5.18.236.0/22
descr:          Z-Telecom
origin:         AS41733
mnt-by:         ZTELECOM-MNT
mnt-by:         RAID-MNT
created:        2017-04-12T10:31:46Z
last-modified:  2017-04-12T10:31:46Z
source:         RIPE # Filtered

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

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