% APNIC found the following authoritative answer from: whois.ripe.net

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% The objects are in RPSL format.
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% Information related to '217.75.208.0 - 217.75.212.255'

% Abuse contact for '217.75.208.0 - 217.75.212.255' is 'hotline@grapesc.cz'

inetnum:        217.75.208.0 - 217.75.212.255
netname:        GRAPESC-NET
geoloc:         50.47380 13.41180
org:            ORG-GS394-RIPE
country:        CZ
admin-c:        GS5801-RIPE
tech-c:         GS5801-RIPE
abuse-c:        GS5801-RIPE
status:         ASSIGNED PA
mnt-by:         MNT-GRAPESC
created:        2019-02-06T09:56:16Z
last-modified:  2025-08-29T13:03:23Z
source:         RIPE
descr:          GRAPE SC, a.s. - ISP
remarks:        This prefix is used for residential broadband ISP services.

organisation:   ORG-GS394-RIPE
org-name:       GRAPE SC,a.s.
org-type:       OTHER
address:        Karlovo námestí 559/28
address:        Nove Mesto 120 00 Praha 2
abuse-c:        GS22558-RIPE
mnt-ref:        MNT-GRAPESC
mnt-by:         MNT-GRAPESC
created:        2020-07-01T13:42:03Z
last-modified:  2023-08-03T08:41:28Z
source:         RIPE # Filtered

role:           GRAPESC
address:        Karlovo nám?stí 559/28
address:        120 00 Praha 2
address:        Czech Republic
phone:          +420800911911
admin-c:        LR2038-RIPE
tech-c:         LR2038-RIPE
abuse-mailbox:  hotline@grapesc.cz
nic-hdl:        GS5801-RIPE
mnt-by:         MNT-GRAPESC
created:        2008-05-14T08:34:47Z
last-modified:  2023-07-18T16:39:57Z
source:         RIPE # Filtered

% Information related to '217.75.209.0/24AS210712'

route:          217.75.209.0/24
origin:         AS210712
mnt-by:         MNT-GRAPESC
created:        2022-03-25T09:35:19Z
last-modified:  2022-03-25T09:35:19Z
source:         RIPE

% Information related to '217.75.209.0/24AS47232'

route:          217.75.209.0/24
origin:         AS47232
created:        2022-03-22T07:39:15Z
last-modified:  2022-03-22T07:39:15Z
source:         RIPE
mnt-by:         MNT-GRAPESC

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