% 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 '2a00:1028::/29'

% Abuse contact for '2a00:1028::/29' is 'abuse@o2.cz'

inet6num:       2a00:1028::/29
netname:        CZ-CZNET-20090619
country:        CZ
org:            ORG-STaN1-RIPE
admin-c:        HVJI1-RIPE
tech-c:         MV96-RIPE
status:         ALLOCATED-BY-RIR
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         AS5610-MTN
created:        2016-02-24T09:19:22Z
last-modified:  2016-07-12T11:25:57Z
source:         RIPE # Filtered

organisation:   ORG-STaN1-RIPE
org-name:       O2 Czech Republic, a.s.
country:        CZ
org-type:       LIR
address:        Za Brumlovkou 266/2
address:        140 22
address:        Praha 4 - Michle
address:        CZECH REPUBLIC
phone:          +420 2 71466184
fax-no:         +420 2 71464414
admin-c:        VAKO1-RIPE
admin-c:        MV96-RIPE
admin-c:        HVJI1-RIPE
tech-c:         CZO2-RIPE
abuse-c:        AR14410-RIPE
mnt-ref:        RIPE-NCC-HM-MNT
mnt-ref:        AS5610-MTN
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         AS5610-MTN
created:        2004-04-17T11:04:17Z
last-modified:  2020-12-16T12:31:56Z
source:         RIPE # Filtered

person:         Jiri Hvezda
address:        O2 Czech Republic, a.s.
address:        Za Brumlovkou 2
address:        Prague 4 - 140 22
address:        The Czech Republic
phone:          +420 2 84084222
nic-hdl:        HVJI1-RIPE
created:        2002-07-22T13:31:48Z
last-modified:  2020-06-25T13:10:19Z
source:         RIPE # Filtered
mnt-by:         AS5610-MTN

person:         Marek Vogel
address:        O2 Czech Republic a.s.
address:        Za Brumlovkou 2
address:        Prague 4 - 140 22
address:        Czech Republic
phone:          +420 2 71466184
nic-hdl:        MV96-RIPE
created:        1970-01-01T00:00:00Z
last-modified:  2017-10-30T21:45:07Z
source:         RIPE # Filtered
mnt-by:         AS5610-MTN

% Information related to '2a00:1028::/32AS5610'

route6:         2a00:1028::/32
descr:          O2 CZ
origin:         AS5610
mnt-by:         AS5610-MTN
created:        2010-02-10T14:30:02Z
last-modified:  2019-04-03T12:13:56Z
source:         RIPE

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

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