% 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 '203.113.20.0 - 203.113.23.255'

% Abuse contact for '203.113.20.0 - 203.113.23.255' is 'abuse@totisp.net'

inetnum:        203.113.20.0 - 203.113.23.255
netname:        totnet
descr:          TOT Public Company Limited Bangkok
country:        th
admin-c:        pa82-ap
tech-c:         pf104-ap
status:         assigned non-portable
mnt-by:         maint-th-tot
last-modified:  2008-09-17T08:59:02Z
source:         APNIC

person:         Pansak Arpakajorn
nic-hdl:        PA82-AP
e-mail:         abuse@totisp.net
address:        TOT Public Company Limited
address:        89/2 Moo 3 Chaengwattana Rd, Laksi,Bangkok 10210 THAILAND
phone:          +66-2574-9178
fax-no:         +66-2574-8401
country:        TH
mnt-by:         MAINT-TH-TOT
last-modified:  2010-05-07T07:54:11Z
source:         APNIC

person:         Paisarn Fuengsilpe
nic-hdl:        PF104-AP
e-mail:         paisarnf@gmail.com
address:        TOT Public Company Limited
address:        89/2 Moo 3 Chaengwattana Rd, Laksi, Bangkok 10210 THAILAND
phone:          +66 2 5754902
fax-no:         +66 2 5755893
country:        th
mnt-by:         MAINT-TH-TOT
last-modified:  2008-09-04T07:49:50Z
source:         APNIC

% Information related to '203.113.20.0/24AS23969'

route:          203.113.20.0/24
origin:         AS23969
descr:          TOT Public Company Limited
                National Telecom Public Company Limited
                Chaengwattana Office
                89/2 Chaengwatthana Road
                Thoongsonghong
mnt-by:         MAINT-TH-TOT
last-modified:  2025-12-09T06:57:54Z
source:         APNIC

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