shell:$ nslookup -timeout=2 -retry=1 'tracking.ibt.uber.com'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
tracking.ibt.uber.com	canonical name = emailtracking-us.email-messaging.com.
emailtracking-us.email-messaging.com	canonical name = emailtracking-us-weight.email-messaging.com.
emailtracking-us-weight.email-messaging.com	canonical name = emailtracking-ny2.email-messaging.com.
Name:	emailtracking-ny2.email-messaging.com
Address: 185.255.9.197