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

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% The objects are in RPSL format.
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% Note: this output has been filtered.
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% Information related to '91.209.51.0 - 91.209.51.255'

% Abuse contact for '91.209.51.0 - 91.209.51.255' is 'abuse@it-tv.org'

inetnum:        91.209.51.0 - 91.209.51.255
netname:        UA-INFORM-TECH-20081022
country:        UA
org:            ORG-SEIT1-RIPE
admin-c:        ITTV-RIPE
tech-c:         ITTV-RIPE
status:         ASSIGNED PI
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         MNT-ITTV
mnt-routes:     MNT-ITTV
mnt-domains:    MNT-ITTV
created:        2008-10-22T08:43:42Z
last-modified:  2019-05-08T16:35:09Z
source:         RIPE

organisation:   ORG-SEIT1-RIPE
org-name:       Scientific-Production Enterprise Information Technologies Ltd
country:        UA
org-type:       LIR
address:        Revutskogo 5
address:        02091
address:        Kiev
address:        UKRAINE
phone:          +380445864570
admin-c:        ITTV-RIPE
tech-c:         ITTV-RIPE
abuse-c:        ITTV3-RIPE
mnt-ref:        MNT-ITTV
mnt-ref:        RIPE-NCC-HM-MNT
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         MNT-ITTV
created:        2010-11-01T10:36:26Z
last-modified:  2020-12-16T12:37:36Z
source:         RIPE # Filtered

role:           IT-TV Network Administrators
address:        Revutskogo 5
address:        02091
address:        Kiev
address:        UKRAINE
admin-c:        AL4808-RIPE
admin-c:        EB579-RIPE
tech-c:         AL4808-RIPE
tech-c:         EB579-RIPE
nic-hdl:        ITTV-RIPE
mnt-by:         MNT-ITTV
created:        2013-01-22T10:09:44Z
last-modified:  2019-05-07T15:58:58Z
source:         RIPE # Filtered

% Information related to '91.209.51.0/24AS48239'

route:          91.209.51.0/24
origin:         AS48239
descr:          End user ip pool
mnt-by:         MNT-ITTV
created:        2008-12-02T15:07:55Z
last-modified:  2019-05-09T08:51:32Z
source:         RIPE

% 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
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-d	Associated reverse domain