shell:$ nslookup -timeout=2 -retry=1 'smartnas-app.s3.ap-southeast-1.amazonaws.com'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
smartnas-app.s3.ap-southeast-1.amazonaws.com	canonical name = s3-r-w.ap-southeast-1.amazonaws.com.
Name:	s3-r-w.ap-southeast-1.amazonaws.com
Address: 3.5.149.48
Name:	s3-r-w.ap-southeast-1.amazonaws.com
Address: 52.219.164.98
Name:	s3-r-w.ap-southeast-1.amazonaws.com
Address: 52.219.129.82
Name:	s3-r-w.ap-southeast-1.amazonaws.com
Address: 3.5.151.227
Name:	s3-r-w.ap-southeast-1.amazonaws.com
Address: 3.5.149.188
Name:	s3-r-w.ap-southeast-1.amazonaws.com
Address: 52.219.132.75
Name:	s3-r-w.ap-southeast-1.amazonaws.com
Address: 3.5.147.177
Name:	s3-r-w.ap-southeast-1.amazonaws.com
Address: 52.219.128.143