shell:$ nslookup -timeout=2 -retry=1 'smartedu.com.kh'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
Name:	smartedu.com.kh
Address: 104.18.24.210
Name:	smartedu.com.kh
Address: 104.18.25.210