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

% [whois.apnic.net]
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% Information related to '203.144.64.0 - 203.144.95.255'

% Abuse contact for '203.144.64.0 - 203.144.95.255' is 'operations@ezecom.com.kh'

inetnum:        203.144.64.0 - 203.144.95.255
netname:        CamGSM-CELLCARD
descr:          CAMGSM Company Ltd
country:        KH
org:            ORG-CCL3-AP
admin-c:        CIA7-AP
tech-c:         CIA7-AP
abuse-c:        AC1994-AP
status:         ALLOCATED PORTABLE
remarks:        --------------------------------------------------------
remarks:        To report network abuse, please contact mnt-irt
remarks:        For troubleshooting, please contact tech-c and admin-c
remarks:        Report invalid contact via www.apnic.net/invalidcontact
remarks:        --------------------------------------------------------
mnt-by:         APNIC-HM
mnt-lower:      MAINT-KH-CAMGSM-LTD
mnt-routes:     MAINT-KH-CAMGSM-LTD
mnt-irt:        IRT-CAMGSM-KH
last-modified:  2020-10-20T00:57:07Z
source:         APNIC

irt:            IRT-CAMGSM-KH
address:        33 Preah Sihanouk Blvd.
address:        p.o.box 2468 phnom penh
address:        Kingdom of Cambodia.
e-mail:         operations@ezecom.com.kh
abuse-mailbox:  operations@ezecom.com.kh
admin-c:        MJ160-AP
tech-c:         TM82-AP
auth:           # Filtered
remarks:        operations@ezecom.com.kh
remarks:        operations@ezecom.com.kh
remarks:        operations@ezecom.com.kh was validated on 2025-10-09
mnt-by:         MAINT-KH-CAMGSM-LTD
last-modified:  2026-01-09T03:08:11Z
source:         APNIC

organisation:   ORG-CCL3-AP
org-name:       CAMGSM Company Ltd
org-type:       LIR
country:        KH
address:        33 Preah Sihanouk Blvd
address:        P.O. Box 2468
phone:          +855-12-800-800
fax-no:         +855-12-801-801
e-mail:         it@cellcard.com.kh
mnt-ref:        APNIC-HM
mnt-by:         APNIC-HM
last-modified:  2023-09-05T02:14:51Z
source:         APNIC

role:           ABUSE CAMGSMKH
country:        ZZ
address:        33 Preah Sihanouk Blvd.
address:        p.o.box 2468 phnom penh
address:        Kingdom of Cambodia.
phone:          +000000000
e-mail:         operations@ezecom.com.kh
admin-c:        MJ160-AP
tech-c:         TM82-AP
nic-hdl:        AC1994-AP
remarks:        Generated from irt object IRT-CAMGSM-KH
remarks:        operations@ezecom.com.kh was validated on 2025-10-09
abuse-mailbox:  operations@ezecom.com.kh
mnt-by:         APNIC-ABUSE
last-modified:  2025-10-09T02:29:59Z
source:         APNIC

role:           CamGSM IP Admin
address:        33 Presihanouk Blvd, Phnom Penh, Cambodia
country:        KH
phone:          +85512800800
fax-no:         +855-12-801801
e-mail:         it@camgsm.com.kh
admin-c:        BS652-AP
tech-c:         BS652-AP
nic-hdl:        CIA7-AP
abuse-mailbox:  it@camgsm.com.kh
mnt-by:         MAINT-KH-CAMGSM-LTD
last-modified:  2013-06-12T02:54:07Z
source:         APNIC

% Information related to '203.144.75.0/24AS17976'

route:          203.144.75.0/24
origin:         AS17976
descr:          CAMGSM Company Ltd
                33 Preah Sihanouk Blvd
                P.O. Box 2468
mnt-by:         MAINT-KH-CAMGSM-LTD
last-modified:  2022-05-24T05:02:21Z
source:         APNIC

% This query was served by the APNIC Whois Service version 1.88.36-SNAPSHOT (WHOIS-AU5)