DNS Morons

These people should run Split-horizon DNS;

HostWrong IP addressReason
dns01.hb.chinamobile.com192.168.20.2RFC 1918
dns1.cootel.com.kh172.16.251.77RFC 1918
dns2.cootel.com.kh172.16.251.88RFC 1918
DNS3.ELETROPAULO.COM.BR::ffff:201.131.209.254IPv4-mapped IPv6 addresses
DNS4.ELETROPAULO.COM.BR::ffff:201.131.211.254IPv4-mapped IPv6 addresses
dns.unife.it::ffff:192.167.219.2IPv4-mapped IPv6 addresses
hertz.xl.net.id64:ff9b::ca98:fef6RFC 6052
ibdxbns3.duhosting.ae10.198.18.10RFC 1918
ibdxbns4.duhosting.ae10.198.18.14RFC 1918
mail1.yogyaonline.co.id172.16.7.87RFC 1918
ns1.exchangenext.net10.8.54.252RFC 1918
ns1.netplus.co.in64:ff9b::6729:17c2RFC 6052
ns2.exchangenext.net10.8.54.195RFC 1918
ns2.netplus.co.in64:ff9b::6729:17c3RFC 6052
ns5.tataidc.co.in64:ff9b::6708:2c05RFC 6052
NSA.TIGO.COM.GT10.10.11.2RFC 1918
socrates.xl.net.id64:ff9b::ca98:fef5RFC 6052

Last update: Sun 21 Oct 06:02:01 UTC 2018

Block

You can block answers like these with Bind's 'deny-answer-addresses' feature;

    deny-answer-addresses {
        // Unconfigured
        0.0.0.0;
        // RFC 1918
        10.0.0.0/8;
        172.16.0.0/12;
        192.168.0.0/16;
        // RFC 3927
        169.254.0.0/16;
        // IPv6
        // :: to ::ffff:ffff:ffff.
        // Includes ::, ::1, IPv4-Compatible IPv6 Addresses ::/96,
        // and IPv4-mapped IPv6 addresses ::ffff:0:0/96
        ::/80;
        // IPv6 Link local
        fe80::/10;
        // RFC 6052
        64:ff9b::/96;
    } except-from { "Your.Domain"; };
    deny-answer-aliases { "Your.Domain"; };

The produces log entries like;

Aug 21 19:31:01 sput named[1601]: answer address 10.0.0.100 denied for spacefon.com/A/IN

Not blocking these addresses can be a serious security risk.