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

% [whois.apnic.net]
% Whois data copyright terms    http://www.apnic.net/db/dbcopyright.html

% Information related to '203.187.133.0 - 203.187.133.255'

% Abuse contact for '203.187.133.0 - 203.187.133.255' is 'abuse@eu.bt.net'

inetnum:        203.187.133.0 - 203.187.133.255
netname:        BT-GIA-SGP-14
descr:          BT-GIA
country:        SG
admin-c:        MB29-AP
tech-c:         MB29-AP
status:         ALLOCATED NON-PORTABLE
mnt-by:         MAINT-AP-INFONET
mnt-irt:        IRT-INFONET-AP
abuse-c:        AI330-AP
geoloc:         1.338014 103.893795
last-modified:  2025-04-25T07:29:49Z
source:         APNIC

irt:            IRT-INFONET-AP
address:        BT Global Services
e-mail:         matthias.blum@bt.com
abuse-mailbox:  abuse@eu.bt.net
admin-c:        MB29-AP
tech-c:         MB29-AP
auth:           # Filtered
remarks:        matthias.blum@bt.com was validated on 2025-12-30
remarks:        abuse@eu.bt.net was validated on 2026-01-05
mnt-by:         MAINT-AP-INFONET
last-modified:  2026-05-18T10:57:39Z
source:         APNIC

role:           ABUSE INFONETAP
country:        ZZ
address:        BT Global Services
phone:          +000000000
e-mail:         matthias.blum@bt.com
admin-c:        MB29-AP
tech-c:         MB29-AP
nic-hdl:        AI330-AP
remarks:        Generated from irt object IRT-INFONET-AP
remarks:        matthias.blum@bt.com was validated on 2025-12-30
remarks:        abuse@eu.bt.net was validated on 2026-01-05
abuse-mailbox:  abuse@eu.bt.net
mnt-by:         APNIC-ABUSE
last-modified:  2026-01-05T07:08:50Z
source:         APNIC

person:         Matthias Blum
address:        BT
address:        Telecomlaan 9
address:        B-1831 Diegem
address:        Belgium
country:        BE
phone:          +32 2 700 2851
fax-no:         +32 2 200 2851
e-mail:         matthias.blum@bt.com
mnt-by:         MAINT-AP-INFONET
nic-hdl:        MB29-AP
last-modified:  2015-06-05T07:45:20Z
source:         APNIC

% Information related to '203.187.133.0/24AS3300'

route:          203.187.133.0/24
origin:         AS3300
descr:          Infonet Services Corporation
                2160 East Grand Avenue
mnt-by:         MAINT-AP-INFONET
last-modified:  2022-06-16T07:48:20Z
source:         APNIC

% This query was served by the APNIC Whois Service version 1.88.48 (WHOIS-AU4)