shell:$ nslookup -timeout=2 -retry=1 'h.facebook.com'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
h.facebook.com	canonical name = headers-regional.vvv.facebook.com.
Name:	headers-regional.vvv.facebook.com
Address: 173.252.127.252
Name:	headers-regional.vvv.facebook.com
Address: 2a03:2880:21ff:fffe:face:b00c:0:1