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: 35.174.118.36
Name:	checkip.us-east-1.prod.check-ip.aws.a2z.com
Address: 13.216.125.235
Name:	checkip.us-east-1.prod.check-ip.aws.a2z.com
Address: 34.201.81.124
Name:	checkip.us-east-1.prod.check-ip.aws.a2z.com
Address: 44.221.195.122
Name:	checkip.us-east-1.prod.check-ip.aws.a2z.com
Address: 52.20.56.176
Name:	checkip.us-east-1.prod.check-ip.aws.a2z.com
Address: 52.203.49.206
Name:	checkip.us-east-1.prod.check-ip.aws.a2z.com
Address: 54.236.225.22
Name:	checkip.us-east-1.prod.check-ip.aws.a2z.com
Address: 34.205.217.211