% 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 '91.240.48.0 - 91.240.51.255'

% Abuse contact for '91.240.48.0 - 91.240.51.255' is 'abuse@novaposhta.ua'

inetnum:        91.240.48.0 - 91.240.51.255
netname:        NOVAPOSHTA-NET
country:        UA
org:            ORG-NPL4-RIPE
admin-c:        NN2241-RIPE
tech-c:         NN2241-RIPE
tech-c:         NN2241-RIPE
status:         ASSIGNED PI
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         NOVAPOSHTA-MNT
mnt-routes:     NOVAPOSHTA-MNT
mnt-domains:    NOVAPOSHTA-MNT
created:        2012-06-12T07:48:13Z
last-modified:  2020-11-16T17:42:26Z
source:         RIPE
sponsoring-org: ORG-DL9-RIPE

organisation:   ORG-NPL4-RIPE
org-name:       Nova Poshta Ltd.
country:        UA
org-type:       OTHER
address:        Ukraine, Poltava
address:        Europeis'ka st., 57
phone:          +380532696110
abuse-c:        AR24438-RIPE
admin-c:        NN2241-RIPE
tech-c:         NN2241-RIPE
mnt-ref:        NOVAPOSHTA-MNT
mnt-by:         NOVAPOSHTA-MNT
created:        2010-10-12T07:44:29Z
last-modified:  2022-12-01T16:39:53Z
source:         RIPE # Filtered

role:           NOVAPOSHTA NOC
address:        Nova Poshta ltd.
address:        Ukraine, Poltava
address:        Europeis'ka st., 57
remarks:        http://www.novaposhta.ua
abuse-mailbox:  abuse@novaposhta.ua  <abuse@novaposhta.ua>
remarks:        in case of abuse please contact: abuse@novaposhta.ua
remarks:        for operational issues please contact: noc@novaposhta.ua
admin-c:        BOO
tech-c:         BOO
nic-hdl:        NN2241-RIPE
mnt-by:         NOVAPOSHTA-MNT
created:        2016-02-23T09:25:37Z
last-modified:  2019-03-04T18:25:51Z
source:         RIPE # Filtered

% Information related to '91.240.50.0/24AS51950'

route:          91.240.50.0/24
descr:          Novaposhta Network #3
origin:         AS51950
mnt-by:         NOVAPOSHTA-MNT
created:        2012-06-20T12:09:07Z
last-modified:  2012-06-20T12:09:07Z
source:         RIPE

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

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