% 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 '43.239.220.0 - 43.239.223.255'

% Abuse contact for '43.239.220.0 - 43.239.223.255' is 'hm-changed@vnnic.vn'

inetnum:        43.239.220.0 - 43.239.223.255
netname:        KDATA-VN
descr:          KDATA Company Limited
descr:          5th Floor, TF Building, 408 Dien Bien Phu, Ward 11, District 10, Ho Chi Minh City, Vietnam
admin-c:        DHD11-AP
tech-c:         NVD31-AP
remarks:        send spam and abuse report to info@kdata.vn
country:        VN
mnt-by:         MAINT-VN-VNNIC
mnt-lower:      MAINT-VN-VNNIC
mnt-irt:        IRT-VNNIC-AP
status:         ALLOCATED PORTABLE
last-modified:  2024-12-08T07:49:49Z
source:         APNIC

irt:            IRT-VNNIC-AP
address:        Ha Noi, VietNam
phone:          +84-24-35564944
fax-no:         +84-24-37821462
e-mail:         hm-changed@vnnic.vn
abuse-mailbox:  hm-changed@vnnic.vn
admin-c:        NTTT1-AP
tech-c:         NTTT1-AP
auth:           # Filtered
mnt-by:         MAINT-VN-VNNIC
last-modified:  2025-11-17T23:08:34Z
source:         APNIC

person:         Dao Hong Diep
address:        KDATA-VN
country:        VN
phone:          +84-977056600
e-mail:         diepdh@kdata.vn
nic-hdl:        DHD11-AP
mnt-by:         MAINT-VN-VNNIC
last-modified:  2024-12-08T07:48:06Z
source:         APNIC

person:         Nguyen Van Duy
address:        KDATA-VN
country:        VN
phone:          +84-977562991
e-mail:         duynv@kdata.vn
nic-hdl:        NVD31-AP
mnt-by:         MAINT-VN-VNNIC
last-modified:  2024-12-08T07:48:42Z
source:         APNIC

% Information related to '43.239.221.0/24AS45899'

route:          43.239.221.0/24
descr:          KDATA-VN
origin:         AS45899
mnt-by:         MAINT-VN-VNNIC
last-modified:  2024-12-04T10:13:02Z
source:         APNIC

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