% 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 '175.156.0.0 - 175.156.127.255'

% Abuse contact for '175.156.0.0 - 175.156.127.255' is 'abuse@m1.com.sg'

inetnum:        175.156.0.0 - 175.156.127.255
netname:        M1Net
descr:          M1 Ltd
country:        SG
admin-c:        MH607-AP
tech-c:         MH607-AP
abuse-c:        AM2690-AP
status:         ALLOCATED NON-PORTABLE
mnt-by:         MAINT-AP-MOBILEONE-SG
mnt-lower:      MAINT-AP-MOBILEONE-SG
mnt-routes:     MAINT-AP-MOBILEONE-SG
mnt-irt:        IRT-MOBILEONELTD-SG
last-modified:  2021-01-18T03:44:00Z
source:         APNIC

irt:            IRT-MOBILEONELTD-SG
address:        10 International Business Park,
address:        Singapore 609928
e-mail:         peering@m1.com.sg
abuse-mailbox:  abuse@m1.com.sg
admin-c:        PRHS1-AP
tech-c:         LZ4052-AP
auth:           # Filtered
remarks:        peering@m1.com.sg is invalid
remarks:        abuse@m1.com.sg was validated on 2025-03-12
mnt-by:         MAINT-AP-MOBILEONE-SG
last-modified:  2025-03-13T06:41:18Z
source:         APNIC

role:           ABUSE MOBILEONELTDSG
country:        ZZ
address:        10 International Business Park,
address:        Singapore 609928
phone:          +000000000
e-mail:         peering@m1.com.sg
admin-c:        PRHS1-AP
tech-c:         LZ4052-AP
nic-hdl:        AM2690-AP
remarks:        Generated from irt object IRT-MOBILEONELTD-SG
remarks:        peering@m1.com.sg is invalid
remarks:        abuse@m1.com.sg was validated on 2025-03-12
abuse-mailbox:  abuse@m1.com.sg
mnt-by:         APNIC-ABUSE
last-modified:  2025-03-13T06:41:34Z
source:         APNIC

person:         M1 Hostmaster
e-mail:         hostmaster@m1.com.sg
address:        10 International Business Park,
address:        Singapore 609928
phone:          +65 66551111
fax-no:         +65 66551959
country:        SG
nic-hdl:        MH607-AP
remarks:        Spam and Security Issues: vas@m1.com.sg
notify:         hostmaster@m1.com.sg
mnt-by:         MAINT-AP-MOBILEONE-SG
last-modified:  2011-12-06T03:21:40Z
source:         APNIC

% Information related to '175.156.48.0/24AS4773'

route:          175.156.48.0/24
descr:          M1 Limited
                Internet Service Provider
                10 International Business Park,
                Singapore 609928
origin:         AS4773
mnt-by:         MAINT-AP-MOBILEONE-SG
last-modified:  2021-07-14T09:45:49Z
source:         APNIC

% This query was served by the APNIC Whois Service version 1.88.34 (WHOIS-AU4)