_autodiscover._tcp.comcast.com. TXT RRSIG NSEC
Question and response
Question
dig _spf.comcast.com. NSEC
Answer
_spf.comcast.com. 900 NSEC _autodiscover._tcp.comcast.com. TXT RRSIG NSEC
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0