% 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 '5.45.192.0 - 5.45.255.255'

% Abuse contact for '5.45.192.0 - 5.45.255.255' is 'abuse@yandex.ru'

inetnum:        5.45.192.0 - 5.45.255.255
netname:        RU-YANDEX-20120525
country:        RU
org:            ORG-YA1-RIPE
admin-c:        YNDX1-RIPE
tech-c:         YNDX1-RIPE
status:         ALLOCATED PA
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         YANDEX-MNT
mnt-lower:      YANDEX-MNT
mnt-routes:     YANDEX-MNT
created:        2012-05-25T12:04:37Z
last-modified:  2016-05-19T14:25:15Z
source:         RIPE # Filtered

organisation:   ORG-YA1-RIPE
org-name:       YANDEX LLC
country:        RU
org-type:       LIR
address:        LVA TOLSTOY STREET, 16
address:        119021
address:        Moscow
address:        RUSSIAN FEDERATION
phone:          +74957397000
fax-no:         +74957397070
admin-c:        MK24579-RIPE
admin-c:        AUR2-RIPE
admin-c:        EM3673-RIPE
abuse-c:        YAH6-RIPE
mnt-ref:        RIPE-NCC-HM-MNT
mnt-ref:        YANDEX-MNT
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         YANDEX-MNT
created:        2004-04-22T14:39:02Z
last-modified:  2023-07-17T08:05:45Z
source:         RIPE # Filtered

role:           Yandex LLC Network Operations
address:        Yandex LLC
address:        16, Leo Tolstoy St.
address:        119021
address:        Moscow
address:        Russian Federation
phone:          +7 495 739 7000
fax-no:         +7 495 739 7070
remarks:        trouble: ------------------------------------------------------
remarks:        trouble: Points of contact for Yandex LLC Network Operations
remarks:        trouble: ------------------------------------------------------
remarks:        trouble: Routing and peering issues: noc@yandex.net
remarks:        trouble: SPAM issues: abuse@yandex.ru
remarks:        trouble: Network security issues: abuse@yandex.ru
remarks:        trouble: Mail issues: postmaster@yandex.ru
remarks:        trouble: General information: info@yandex.ru
remarks:        trouble: ------------------------------------------------------
admin-c:        MK24579-RIPE
tech-c:         EM3673-RIPE
tech-c:         AUR2-RIPE
nic-hdl:        YNDX1-RIPE
mnt-by:         YANDEX-MNT
created:        2002-06-07T05:35:50Z
last-modified:  2021-08-23T16:42:06Z
source:         RIPE # Filtered
abuse-mailbox:  abuse@yandex.ru

% Information related to '5.45.192.0/18AS13238'

route:          5.45.192.0/18
descr:          Yandex enterprise network
origin:         AS13238
mnt-by:         YANDEX-MNT
created:        2012-05-25T12:40:45Z
last-modified:  2012-05-25T12:40:45Z
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