shell:$ nslookup -timeout=2 -retry=1 '9-courier2.push.apple.com'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
9-courier2.push.apple.com	canonical name = 9.courier2-push-apple.com.akadns.net.
9.courier2-push-apple.com.akadns.net	canonical name = us-north-courier-vs.push-apple.com.akadns.net.
Name:	us-north-courier-vs.push-apple.com.akadns.net
Address: 17.57.144.135
Name:	us-north-courier-vs.push-apple.com.akadns.net
Address: 17.57.144.138
Name:	us-north-courier-vs.push-apple.com.akadns.net
Address: 17.57.144.137
Name:	us-north-courier-vs.push-apple.com.akadns.net
Address: 17.57.144.134
Name:	us-north-courier-vs.push-apple.com.akadns.net
Address: 17.57.144.136
Name:	us-north-courier-vs.push-apple.com.akadns.net
Address: 2620:149:a44::7
Name:	us-north-courier-vs.push-apple.com.akadns.net
Address: 2620:149:a44::5
Name:	us-north-courier-vs.push-apple.com.akadns.net
Address: 2620:149:a44::4
Name:	us-north-courier-vs.push-apple.com.akadns.net
Address: 2620:149:a44::6