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

Non-authoritative answer:
h.fb.com	canonical name = headers-regional.vvv.facebook.com.
Name:	headers-regional.vvv.facebook.com
Address: 66.220.149.254
Name:	headers-regional.vvv.facebook.com
Address: 2a03:2880:10ff:fffe:face:b00c:0:1