% 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 '203.162.206.0 - 203.162.206.255'

% Abuse contact for '203.162.206.0 - 203.162.206.255' is 'hm-changed@vnnic.vn'

inetnum:        203.162.206.0 - 203.162.206.255
netname:        NETNAM-NET
country:        VN
descr:          Netnam Company
descr:          60 Nguyen Du, District 1, Ho Chi Minh city
admin-c:        NDA1-AP
tech-c:         LHB1-AP
status:         ASSIGNED NON-PORTABLE
mnt-by:         VNPT
last-modified:  2008-09-04T06:53:19Z
source:         APNIC

person:         Le Hong Boi
nic-hdl:        LHB1-AP
e-mail:         lhboi@hcmc.netnam.vn
address:        Netnam Company
address:        60 Nguyen Du, District 1, Ho Chi Minh city
phone:          +84-8-8244907
fax-no:         +84-8-8222606
country:        VN
mnt-by:         MAINT-VN-VNNIC
last-modified:  2008-09-04T07:31:10Z
source:         APNIC

person:         Ngo Duc Anh
nic-hdl:        NDA1-AP
e-mail:         ndanh@hcmc.netnam.vn
address:        Netnam Company
address:        60 Nguyen Du, District 1, Ho Chi Minh city
phone:          +84-8-8244907
fax-no:         +84-8-8222606
country:        VN
mnt-by:         MAINT-VN-VNNIC
last-modified:  2008-09-04T07:31:10Z
source:         APNIC

% Information related to '203.162.206.0/24AS45899'

route:          203.162.206.0/24
descr:          VNPT
origin:         AS45899
mnt-by:         MAINT-VN-VNPT
last-modified:  2022-07-29T17:32:25Z
source:         APNIC

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