Question and response
Question
dig _netblocks.srv.cat. TXT
Answer
_netblocks.srv.cat. 60 TXT "v=spf1 ip4:46.16.56.0/21 ip4:134.0.8.0/21 ip4:185.22.200.0/22 ip4:185.34.192.0/22 ip4:185.42.104.0/22 ip4:185.66.40.0/22 ip4:185.22.201.0/22 ~all"
Authority
srv.cat. 172800 NS ns-1107.awsdns-10.org.
srv.cat. 172800 NS ns-1573.awsdns-04.co.uk.
srv.cat. 172800 NS ns-358.awsdns-44.com.
srv.cat. 172800 NS ns-695.awsdns-22.net.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0