shell:$ nslookup -timeout=2 -retry=1 'crt.sca1b.amazontrust.com'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
Name:	crt.sca1b.amazontrust.com
Address: 18.238.35.150
Name:	crt.sca1b.amazontrust.com
Address: 18.238.35.97
Name:	crt.sca1b.amazontrust.com
Address: 18.238.35.219
Name:	crt.sca1b.amazontrust.com
Address: 18.238.35.144