% 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 '203.113.146.224 - 203.113.146.255'

% Abuse contact for '203.113.146.224 - 203.113.146.255' is 'hm-changed@vnnic.vn'

inetnum:        203.113.146.224 - 203.113.146.255
netname:        HwaSeungVN-Net
country:        vn
descr:          Dai IP cho Cong ty HwaSeung Vina
descr:          Khu CN Nhon Trach I, Nhon Trach, Dong nai
admin-c:        VIG4-AP
tech-c:         VIG4-AP
status:         ASSIGNED NON-PORTABLE
mnt-by:         MAINT-VN-VIETEL
last-modified:  2008-09-04T07:22:09Z
source:         APNIC

role:           VIETEL IPADMIN GROUP
address:        No 1, Tran Huu Duc street, My Dinh 2 ward, Nam Tu Liem district, Ha Noi City
country:        VN
phone:          +84-4-62989898
e-mail:         soc@viettel.com.vn
remarks:        send spam and abuse report to soc@viettel.com.vn
admin-c:        TVT8-AP
tech-c:         NDT9-AP
nic-hdl:        VIG4-AP
mnt-by:         MAINT-VN-VIETEL
last-modified:  2017-11-12T03:43:03Z
source:         APNIC

% Information related to '203.113.146.0/24AS24086'

route:          203.113.146.0/24
descr:          VIETTEL-VN
origin:         AS24086
mnt-by:         MAINT-VN-VIETEL
last-modified:  2025-08-27T13:55:07Z
source:         APNIC

% Information related to '203.113.146.0/24AS38731'

route:          203.113.146.0/24
descr:          VIETTEL-VN
origin:         AS38731
mnt-by:         MAINT-VN-VIETEL
last-modified:  2025-08-27T14:00:55Z
source:         APNIC

% Information related to '203.113.146.0/24AS7552'

route:          203.113.146.0/24
descr:          VIETTEL-VN
origin:         AS7552
mnt-by:         MAINT-VN-VIETEL
last-modified:  2023-02-10T16:54:00Z
source:         APNIC

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