Question and response
Question
dig spfb.frontbridge.com. NSEC3
Answer
The response has no answer records.
Authority
frontbridge.com. 60 SOA ns1a.o365filtering.com. isgnoc.microsoft.com. 2019100702 10800 3600 604800 60
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0