% 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 '2a00:1e88:8000::/36'

% Abuse contact for '2a00:1e88:8000::/36' is 'abuse@rt.ru'

inet6num:       2a00:1e88:8000::/36
netname:        RTK-VOLGA-MRF-IPv6-SARATOV2
descr:          IP address space for Saratov Branch
country:        RU
admin-c:        VT-RU
tech-c:         VT-RU
status:         ASSIGNED
mnt-by:         MNT-VOLGATELECOM
created:        2021-08-23T06:22:12Z
last-modified:  2021-08-23T06:22:12Z
source:         RIPE

role:           OJSC Rostelecom, Nizhny Novgorod
address:        3, sq.Marshala Zhukova
address:        603022, Nizhny Novgorod
address:        Russia
phone:          +7 831 4360222
fax-no:         +7 831 4199707
admin-c:        ASV77-RIPE
tech-c:         ASV77-RIPE
nic-hdl:        VT-RU
mnt-by:         NMTS-MNT
created:        2007-02-20T09:09:55Z
last-modified:  2021-09-14T10:42:37Z
source:         RIPE # Filtered

% Information related to '2a00:1e88::/32AS12389'

route6:         2a00:1e88::/32
descr:          Rostelecom networks
origin:         AS12389
mnt-by:         ROSTELECOM-MNT
created:        2018-12-14T09:12:24Z
last-modified:  2018-12-14T09:12:24Z
source:         RIPE # Filtered

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