shell:$ nslookup -timeout=2 -retry=1 'checkip.amazonaws.com'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
checkip.amazonaws.com	canonical name = checkip.check-ip.aws.a2z.com.
checkip.check-ip.aws.a2z.com	canonical name = checkip.us-east-1.prod.check-ip.aws.a2z.com.
Name:	checkip.us-east-1.prod.check-ip.aws.a2z.com
Address: 44.207.111.15
Name:	checkip.us-east-1.prod.check-ip.aws.a2z.com
Address: 3.228.79.138
Name:	checkip.us-east-1.prod.check-ip.aws.a2z.com
Address: 54.82.45.140
Name:	checkip.us-east-1.prod.check-ip.aws.a2z.com
Address: 3.219.189.31
Name:	checkip.us-east-1.prod.check-ip.aws.a2z.com
Address: 52.21.117.145
Name:	checkip.us-east-1.prod.check-ip.aws.a2z.com
Address: 54.165.220.42
Name:	checkip.us-east-1.prod.check-ip.aws.a2z.com
Address: 3.223.241.132
Name:	checkip.us-east-1.prod.check-ip.aws.a2z.com
Address: 52.71.82.159