shell:$ nslookup -timeout=2 -retry=1 'h.facebook.com'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
h.facebook.com	canonical name = headers-regional.vvv.facebook.com.
Name:	headers-regional.vvv.facebook.com
Address: 69.171.252.252
Name:	headers-regional.vvv.facebook.com
Address: 2a03:2880:ff:ffff:face:b00c:0:1