shell:$ nslookup -timeout=2 -retry=1 'crt.rootca1.amazontrust.com'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
Name:	crt.rootca1.amazontrust.com
Address: 13.227.87.27
Name:	crt.rootca1.amazontrust.com
Address: 13.227.87.99
Name:	crt.rootca1.amazontrust.com
Address: 13.227.87.69
Name:	crt.rootca1.amazontrust.com
Address: 13.227.87.120