% 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 '90.188.144.0 - 90.188.191.255'

% Abuse contact for '90.188.144.0 - 90.188.191.255' is 'abuse@rt.ru'

inetnum:        90.188.144.0 - 90.188.191.255
netname:        WEBSTREAM
descr:          OJSC "Sibirtelecom"
remarks:        Omsk branch
remarks:        broadband service
country:        RU
remarks:
remarks:        NCC#2007050886
remarks:        INFRA-AW
remarks:
admin-c:        VIK3-RIPE
tech-c:         VAZ14-RIPE
mnt-by:         OEC-MNT
mnt-lower:      NSOELSV-NCC
mnt-lower:      OEC-MNT
mnt-domains:    OEC-MNT
mnt-domains:    NSOELSV-NCC
mnt-routes:     OEC-MNT
mnt-routes:     NSOELSV-NCC
status:         ASSIGNED PA
remarks:
remarks:        Direct reference for the general info on spam,
remarks:        In unsoluble cases for the general info on spam,
remarks:        abusing & hacking complaints email abuse@sinor.ru .
remarks:
created:        2007-08-13T08:54:41Z
last-modified:  2007-12-07T09:36:00Z
source:         RIPE # Filtered

person:         Vitaly A. Zinovjev
address:        Omsk region Electric Communications Joint Stock Comp.
address:        3, Gertsen st.
address:        Omsk, 644099, Russia
phone:          +7 3812 220107
fax-no:         +7 3812 238473
nic-hdl:        VAZ14-RIPE
mnt-by:         OEC-MNT
created:        2002-12-04T04:19:57Z
last-modified:  2004-07-01T07:26:58Z
source:         RIPE # Filtered

person:         Vladimir I. Khlystov
address:        Omsk region Electric Communications Joint Stock Comp.
address:        3, Gertsen st.
address:        Omsk, 644099
address:        Russia
phone:          +7 3812 241219
fax-no:         +7 3812 238473
nic-hdl:        VIK3-RIPE
mnt-by:         OEC-MNT
created:        1970-01-01T00:00:00Z
last-modified:  2002-12-04T04:25:33Z
source:         RIPE # Filtered

% Information related to '90.188.128.0/18AS12389'

route:          90.188.128.0/18
descr:          Rostelecom networks
origin:         AS12389
mnt-by:         ROSTELECOM-MNT
created:        2018-10-31T11:47:21Z
last-modified:  2018-10-31T11:47:21Z
source:         RIPE # Filtered

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

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