% 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 '217.30.78.0 - 217.30.78.255'

% Abuse contact for '217.30.78.0 - 217.30.78.255' is 'abuse@a1m.cz'

inetnum:        217.30.78.0 - 217.30.78.255
netname:        NET-CZ-PLANET-A-78
descr:          Planet A, a.s. network
country:        CZ
org:            ORG-PA290-RIPE
admin-c:        MC241-RIPE
admin-c:        LR6923-RIPE
tech-c:         MC241-RIPE
tech-c:         LR6923-RIPE
status:         ASSIGNED PA
mnt-by:         MNT-CZ-PLANET-A
mnt-lower:      MNT-CZ-PLANET-A
mnt-routes:     MNT-CZ-PLANET-A
created:        2012-12-12T22:09:11Z
last-modified:  2016-05-31T13:12:03Z
source:         RIPE # Filtered

organisation:   ORG-PA290-RIPE
org-name:       Planet A, a.s.
country:        CZ
org-type:       OTHER
descr:          AIM Networks
address:        Tomickova 2144/1
address:        14800
address:        Prague
address:        CZECH REPUBLIC
phone:          +420246089200
fax-no:         +420246089210
admin-c:        HM902-RIPE
admin-c:        MC241-RIPE
admin-c:        MH6987-RIPE
admin-c:        LR6923-RIPE
abuse-c:        AR14456-RIPE
mnt-ref:        MNT-CZ-PLANET-A
mnt-by:         MNT-CZ-PLANET-A
created:        2008-11-19T10:53:55Z
last-modified:  2023-03-21T12:54:37Z
source:         RIPE # Filtered

person:         Lukas Rames
address:        Planet A, a.s.
address:        U Hellady 697/4
address:        Prague 4
address:        140 00
address:        The Czech Republic
phone:          +420 2 46089200
fax-no:         +420 2 46089210
nic-hdl:        LR6923-RIPE
mnt-by:         MNT-CZ-PLANET-A-LR
created:        2016-05-30T15:33:06Z
last-modified:  2016-05-31T07:30:36Z
source:         RIPE # Filtered

person:         Milan Cerny
address:        Planet A, a.s.
address:        U Hellady 697/4
address:        Prague 4
address:        140 00
address:        The Czech Republic
phone:          +420 2 46089203
fax-no:         +420 2 46089210
nic-hdl:        MC241-RIPE
created:        1970-01-01T00:00:00Z
last-modified:  2012-12-12T21:57:40Z
source:         RIPE # Filtered
mnt-by:         MNT-CZ-PLANET-A-MC

% Information related to '217.30.78.0/24AS48574'

route:          217.30.78.0/24
origin:         AS48574
mnt-by:         MNT-CZ-PLANET-A
created:        2016-05-31T10:27:32Z
last-modified:  2016-05-31T10:27:32Z
source:         RIPE

% This query was served by the RIPE Database Query Service version 1.120 (ABERDEEN)