% 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 '175.100.32.0 - 175.100.47.255'

% Abuse contact for '175.100.32.0 - 175.100.47.255' is 'yennp@viettel.com.vn'

inetnum:        175.100.32.0 - 175.100.47.255
netname:        VIETTEL-CAMBODIA
descr:          VIETTEL (CAMBODIA) PTE., LTD.
country:        KH
admin-c:        VAT6-AP
tech-c:         VAT6-AP
abuse-c:        AV489-AP
status:         ASSIGNED NON-PORTABLE
remarks:        Updating % IP Address is used
notify:         tuva1@viettel.com.vn
mnt-by:         MAINT-KH-VIETTELCAMBODIA
mnt-lower:      MAINT-KH-VIETTELCAMBODIA
mnt-routes:     MAINT-KH-VIETTELCAMBODIA
mnt-irt:        IRT-VIETTEL-CAMBODIA-KH
last-modified:  2021-01-20T06:45:11Z
source:         APNIC

irt:            IRT-VIETTEL-CAMBODIA-KH
address:
e-mail:         yennp@viettel.com.vn
abuse-mailbox:  yennp@viettel.com.vn
admin-c:        VAT6-AP
tech-c:         VAT6-AP
auth:           # Filtered
remarks:        yennp@viettel.com.vn was validated on 2025-08-04
mnt-by:         MAINT-KH-VIETTELCAMBODIA
last-modified:  2025-11-18T00:26:42Z
source:         APNIC

role:           ABUSE VIETTELCAMBODIAKH
country:        ZZ
address:        # 199, Mao Tse Toung Blvd(245), Phnom Penh, Cambodia.
phone:          +000000000
e-mail:         yennp@viettel.com.vn
admin-c:        VAT6-AP
tech-c:         VAT6-AP
nic-hdl:        AV489-AP
remarks:        Generated from irt object IRT-VIETTEL-CAMBODIA-KH
remarks:        yennp@viettel.com.vn was validated on 2025-08-04
abuse-mailbox:  yennp@viettel.com.vn
mnt-by:         APNIC-ABUSE
last-modified:  2025-08-04T10:30:24Z
source:         APNIC

person:         Vo Anh Tu
address:        #42, STR 242, SANGKAT CHATUMUK, KHAN DAUN PENH, PHNOM PENH.
country:        KH
phone:          +855 977068079
e-mail:         tuva1@viettel.com.vn
nic-hdl:        VAT6-AP
mnt-by:         MAINT-NEW
last-modified:  2011-01-27T07:25:27Z
source:         APNIC

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