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

Non-authoritative answer:
mobile.facebook.com	canonical name = star.c10r.facebook.com.
Name:	star.c10r.facebook.com
Address: 57.144.172.141
Name:	star.c10r.facebook.com
Address: 2a03:2880:f356:8d:face:b00c:0:2