shell:$ nslookup -timeout=2 -retry=1 'mqtt-mini.facebook.com'
Server:		127.0.0.53
Address:	127.0.0.53#53

Non-authoritative answer:
mqtt-mini.facebook.com	canonical name = mqtt-mini.c10r.facebook.com.
Name:	mqtt-mini.c10r.facebook.com
Address: 31.13.80.34
Name:	mqtt-mini.c10r.facebook.com
Address: 2a03:2880:f10e:80:face:b00c:0:1ea0