rbl.tdk.net
tdk.net seems dead on http(s)
private
+ https://www.blalert.com/dnsbl/rbl.tdk.net
old link: http://postmaster.tdc.dk/publish.php?id=31787
tdc.dk redirects to yousee.dk
https://web.archive.org/web/20170703084224/http://postmaster.tdc.dk/publish.php?id=31787