% 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 '145.15.0.0 - 145.15.255.255'

% Abuse contact for '145.15.0.0 - 145.15.255.255' is 'abuse@ns.nl'

inetnum:        145.15.0.0 - 145.15.255.255
netname:        NS
descr:          Nederlandse Spoorwegen PI block
country:        NL
abuse-c:        ACRO15229-RIPE
admin-c:        DO3728-RIPE
tech-c:         DO3728-RIPE
tech-c:         KCM
status:         LEGACY
mnt-by:         KPNCM-MNT
mnt-by:         MNT-KPN-CUS
mnt-domains:    MNT-KPN-CUS
mnt-routes:     MNT-KPN-CUS
created:        1970-01-01T00:00:00Z
last-modified:  2018-05-30T13:00:53Z
source:         RIPE

role:           Hostmaster KPN Corporate Market
address:        KPN Corporate market B.V.
address:        Paalbergweg 1-3
address:        1100 DP Amsterdam
address:        The Netherlands
phone:          +31 (0) 20 570 4808
tech-c:         PN4776-RIPE
remarks:        ============================================================
remarks:        Role Object for KPN Corporate Market B.V.
remarks:        For urgent operational issues, change requests, routing
remarks:        policies, etc use the email address "noc-kpncm.datacenters@kpn.com"
remarks:        For portscans, DoS attacks, spam complaints, and other abuse
remarks:        issues please use the email address "abuse@kpn.com".
remarks:        Please include all headers and logging where appropriate.
remarks:        ============================================================
nic-hdl:        KCM
mnt-by:         KPNCM-MNT
created:        2012-03-08T08:17:03Z
last-modified:  2019-06-05T06:23:40Z
source:         RIPE # Filtered

person:         Domein Office
address:        Nederlandse Spoorwegen
address:        I&O
address:        Laan van Puntenburg 100
address:        Postbus 2025 (LVP 8k39)
address:        3500 HA Utrecht
phone:          +31307112421
nic-hdl:        DO3728-RIPE
mnt-by:         MNT-KPN-CUS
created:        2018-05-30T12:59:19Z
last-modified:  2018-05-30T12:59:19Z
source:         RIPE # Filtered

% Information related to '145.15.0.0/22AS21286'

route:          145.15.0.0/22
descr:          KPN Corporate Market B.V. PI block (Nederlandse Spoorwegen)
origin:         AS21286
mnt-by:         KPNCM-MNT
created:        2009-03-04T12:56:25Z
last-modified:  2012-03-09T09:55:44Z
source:         RIPE

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

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