shell:$ nslookup -timeout=2 -retry=1 'smartnas-app.s3.ap-southeast-1.amazonaws.com'
Server:		127.0.0.53
Address:	127.0.0.53#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: 3.5.151.174
Name:	s3-r-w.ap-southeast-1.amazonaws.com
Address: 3.5.147.83
Name:	s3-r-w.ap-southeast-1.amazonaws.com
Address: 3.5.147.127
Name:	s3-r-w.ap-southeast-1.amazonaws.com
Address: 3.5.149.105
Name:	s3-r-w.ap-southeast-1.amazonaws.com
Address: 3.5.149.88
Name:	s3-r-w.ap-southeast-1.amazonaws.com
Address: 3.5.147.170
Name:	s3-r-w.ap-southeast-1.amazonaws.com
Address: 3.5.149.79
Name:	s3-r-w.ap-southeast-1.amazonaws.com
Address: 3.5.149.155