Question and response
Question
dig smtpin.vvv.facebook.com. AAAA
Answer
smtpin.vvv.facebook.com. 60 AAAA 2a03:2880:11ff:fffd:face:b00c:0:686e
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0