% 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://apps.db.ripe.net/docs/HTML-Terms-And-Conditions

% Note: this output has been filtered.
%       To receive output for a database update, use the "-B" flag.

% Information related to '83.96.180.168 - 83.96.180.175'

% Abuse contact for '83.96.180.168 - 83.96.180.175' is 'abuse@proserve.nl'

inetnum:        83.96.180.168 - 83.96.180.175
netname:        NL-CUST-PROSERVE-ID-793
descr:          ProServe NL customer with ID 793
country:        NL
admin-c:        PROS1-RIPE
tech-c:         PROS1-RIPE
status:         ASSIGNED PA
mnt-by:         PROSERVE-MNT
created:        2012-10-18T14:11:44Z
last-modified:  2012-10-18T14:11:44Z
source:         RIPE # Filtered

role:           Proserve role
address:        Proserve B.V.
address:        Oostmaaslaan 71 (15th floor)
address:        3063 AN Rotterdam
address:        The Netherlands
phone:          +31 88 2525 252
remarks:        -===========================================-
remarks:        -> Abuse reports to: abuse@proserve.nl <-
remarks:        -> Everything else: info@proserve.nl <-
remarks:        ---------------------------------------------
remarks:        -> All mail directed to person objects <-
remarks:        -> regarding subjects above will be denied <-
remarks:        -===========================================-
abuse-mailbox:  abuse@proserve.nl
admin-c:        NOC193-RIPE
admin-c:        JRS
tech-c:         NOC193-RIPE
tech-c:         JRS
nic-hdl:        PROS1-RIPE
mnt-by:         PROSERVE-MNT
created:        2002-09-13T09:32:36Z
last-modified:  2019-12-23T15:21:29Z
source:         RIPE # Filtered

% Information related to '83.96.128.0/18AS21155'

route:          83.96.128.0/18
descr:          ProServe Networks
origin:         AS21155
mnt-by:         PROSERVE-MNT
created:        2003-12-18T11:59:22Z
last-modified:  2003-12-18T11:59:22Z
source:         RIPE

% This query was served by the RIPE Database Query Service version 1.111 (SHETLAND)

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
-M	All more specific		Query hints Include "AS" in front of an AS number. Example: AS4808 Include "-t" (template only) or "-v" (template and description) in front of an object name to view the template Example: -t inetnum
-x	Exact match only
-d	Associated reverse domain