Question and response
Question
dig _netblocks.zdsys.com. TXT
Answer
_netblocks.zdsys.com. 300 TXT "v=spf1 ip4:192.161.144.0/20 ip4:185.12.80.0/22 ip4:188.172.128.0/20 ip4:216.198.0.0/18 ip4:103.151.192.0/23 ~all"
Authority
zdsys.com. 300 NS ns-1254.awsdns-28.org.
zdsys.com. 300 NS ns-1588.awsdns-06.co.uk.
zdsys.com. 300 NS ns-429.awsdns-53.com.
zdsys.com. 300 NS ns-968.awsdns-57.net.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0