% 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 '2a00:1800:ff2::/48'

% Abuse contact for '2a00:1800:ff2::/48' is 'abuse@cerberos.cz'

inet6num:       2a00:1800:ff2::/48
assignment-size:58
netname:        CZ-LB--C-CBSN-CZ-58
descr:          CBS holding - clients lb /58
country:        CZ
admin-c:        JP2969-RIPE
tech-c:         VO1009-RIPE
status:         AGGREGATED-BY-LIR
mnt-by:         MNT-CERBEROS
created:        2013-02-21T14:03:46Z
last-modified:  2016-05-23T19:37:09Z
source:         RIPE # Filtered

person:         Jaroslav Polivka
address:        CERBEROS s.r.o.
address:        Blahoslavova 184
address:        Mlada Boleslav
address:        293 01
address:        Czech Republic
phone:          +420326100000
nic-hdl:        JP2969-RIPE
mnt-by:         MNT-CERBEROS
created:        2005-02-23T15:29:57Z
last-modified:  2017-10-30T21:46:36Z
source:         RIPE # Filtered

person:         Vitalij Osypenko
address:        Jestrabi 974/1, Liberec, 46001, Czech republic
phone:          +420732888886
nic-hdl:        VO1009-RIPE
mnt-by:         ATAN-MNT
created:        2016-05-23T13:50:28Z
last-modified:  2017-11-24T15:14:47Z
source:         RIPE

% Information related to '2a00:1800::/32AS42477'

route6:         2a00:1800::/32
descr:          Cerberos advertised routes
origin:         AS42477
mnt-by:         MNT-CERBEROS
created:        2009-12-15T15:07:32Z
last-modified:  2016-05-23T19:55:13Z
source:         RIPE # Filtered

% Information related to '2a00:1800::/32AS57728'

route6:         2a00:1800::/32
descr:          Network of Cerberos
origin:         AS57728
mnt-by:         MNT-HELIOSMB
created:        2020-04-09T07:53:49Z
last-modified:  2020-04-09T07:53:49Z
source:         RIPE

% This query was served by the RIPE Database Query Service version 1.112 (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