shell:$ nslookup -timeout=2 -retry=1 'rcsapp.dtac.co.th'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
rcsapp.dtac.co.th	canonical name = p-rcs-api-elb-01-1587118019.ap-southeast-1.elb.amazonaws.com.
Name:	p-rcs-api-elb-01-1587118019.ap-southeast-1.elb.amazonaws.com
Address: 18.142.141.241