Question and response
Question
dig _spf.tierra.net. TXT
Answer
_spf.tierra.net. 3600 TXT "v=spf1 ip4:209.240.128.0/19 ip4:216.104.160.0/19 ip4:72.1.32.0/20 ~all"
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0