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

Non-authoritative answer:
mobile.discoverapp.com	canonical name = z-p3.facebook.com.
z-p3.facebook.com	canonical name = z-p3.c10r.facebook.com.
Name:	z-p3.c10r.facebook.com
Address: 57.144.173.134
Name:	z-p3.c10r.facebook.com
Address: 2a03:2880:f356:186:face:b00c:0:1cc9