Unknown
[[email protected]:/root]> host -t any 2.0.0.127.usa.bl.blocklist.de
2.0.0.127.usa.bl.blocklist.de has address 127.0.0.2
2.0.0.127.usa.bl.blocklist.de descriptive text “Infected System, see http://www.blocklist.de/en/view.html?ip=127.0.0.2”
Truncate
[[email protected]:/root]> host -t any 2.0.0.127.truncate.gbudb.net
2.0.0.127.truncate.gbudb.net has address 127.0.0.2
2.0.0.127.truncate.gbudb.net descriptive text “Test Record”
More
https://think.unblog.ch/en/realtime-blackhole-lists-with-postfix/