% 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 'ST1217-AP'

role:           siamdata thailand
address:        391 Sangfah Bldg. Fl.5-6 , Bond Street Rd., Bangpood, Pakkret, Nonthaburi 11120
country:        TH
phone:          +6625034265
e-mail:         admin@siamdata.co.th
admin-c:        RT676-AP
tech-c:         RT676-AP
nic-hdl:        ST1217-AP
mnt-by:         MAINT-TANSPIRIT-TH
last-modified:  2023-05-25T04:53:38Z
source:         APNIC

role:           ReadyIDC TH
address:        391/2 Pho Thong Tower, Bond Street Rd., Bangpood, Pakkret, Nonthaburi 11120
country:        TH
phone:          +66025034265
e-mail:         abuse@readyidc.com
admin-c:        RT676-AP
tech-c:         RT676-AP
nic-hdl:        RT676-AP
notify:         abuse@readyidc.com
mnt-by:         MAINT-TH-READYIDC
last-modified:  2023-05-25T04:53:29Z
source:         APNIC

% This query was served by the APNIC Whois Service version 1.88.25 (WHOIS-AU3)

Search for
IP address lookups			Miscellaneous queries
-l	1st level less specific		-i	Inverse attributes	None admin-c admin-c,tech-c,zone-c author cross-mnt cross-nfy local-as mbrs-by-ref member-of mnt-by mnt-lower mnt-nfy mnt-routes notify nserver origin person referral-by rev-srv sub-dom tech-c upd-to zone-c
-L	All less specific		-T	Object types	All as-block as-set aut-num domain filter-set inet-rtr inet6num inetnum irt key-cert mntner peering-set person role route route-set rtr-set
-m	1st level more specific
-M	All more specific		Query hints Include "AS" in front of an AS number. Example: AS4808 Include "-t" (template only) or "-v" (template and description) in front of an object name to view the template Example: -t inetnum
-x	Exact match only
-d	Associated reverse domain