Zone apex
Start of authority
Email
Serial
4207849484
Refresh
4h
Retry
30m
Expire
7d
Negative cache TTL
5m
Question and response
Question
dig smtpin.vvv.facebook.com. SOA
Answer
The response has no answer records.
Authority
facebook.com. 3600 SOA a.ns.facebook.com. dns.facebook.com. 4207849484 14400 1800 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0