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

% [whois.apnic.net]
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% Information related to '203.171.253.0 - 203.171.253.255'

% Abuse contact for '203.171.253.0 - 203.171.253.255' is 'abuse@corp.mekongnet.com.kh'

inetnum:        203.171.253.0 - 203.171.253.255
netname:        MEKONGNET-KH
descr:          Angkor Data Communication
country:        KH
admin-c:        TC1075-AP
tech-c:         TC1075-AP
abuse-c:        AH1289-AP
status:         ALLOCATED NON-PORTABLE
mnt-by:         MAINT-KH-MEKONGNET
mnt-irt:        IRT-HK-NOC-MKN
last-modified:  2025-10-21T01:16:11Z
source:         APNIC

irt:            IRT-HK-NOC-MKN
address:        Unit 3110 31/F
address:        Standard Chartered Tower
address:        Millennium City 1
address:        388 Kwun Tong Road
address:        Kwun Tong Kowloon
e-mail:         noc@corp.mekongnet.com.kh
abuse-mailbox:  abuse@corp.mekongnet.com.kh
admin-c:        HSR-AP
tech-c:         HSR-AP
auth:           # Filtered
remarks:        noc@corp.mekongnet.com.kh was validated on 2025-08-13
remarks:        abuse@corp.mekongnet.com.kh was validated on 2025-10-30
mnt-by:         MAINT-HK-NOC-MKN
last-modified:  2025-11-18T00:33:23Z
source:         APNIC

role:           ABUSE HKNOCMKN
country:        ZZ
address:        Unit 3110 31/F
address:        Standard Chartered Tower
address:        Millennium City 1
address:        388 Kwun Tong Road
address:        Kwun Tong Kowloon
phone:          +000000000
e-mail:         noc@corp.mekongnet.com.kh
admin-c:        HSR-AP
tech-c:         HSR-AP
nic-hdl:        AH1289-AP
remarks:        Generated from irt object IRT-HK-NOC-MKN
remarks:        noc@corp.mekongnet.com.kh was validated on 2025-08-13
remarks:        abuse@corp.mekongnet.com.kh was validated on 2025-10-30
abuse-mailbox:  abuse@corp.mekongnet.com.kh
mnt-by:         APNIC-ABUSE
last-modified:  2025-10-30T11:31:39Z
source:         APNIC

person:         Ty Chan
address:        #95, Norodom Blvd.
country:        KH
phone:          +85512316858
e-mail:         ty.chan@corp.mekongnet.com.kh
nic-hdl:        TC1075-AP
mnt-by:         MAINT-KH-MEKONGNET
last-modified:  2022-08-25T06:40:07Z
source:         APNIC

% Information related to '203.171.253.0/24AS38235'

route:          203.171.253.0/24
origin:         AS38235
descr:          ANGKOR DATA COMMUNICATION GROUP CO., LTD. (A D C)
                Building #95, 4th floor, Norodom Blvd, Phnom Penh, Cambodia.
mnt-by:         MAINT-KH-MEKONGNET
last-modified:  2025-10-24T02:44:40Z
source:         APNIC

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