These people should run Split-horizon DNS;
| Host | Wrong IP address | Reason |
|---|---|---|
| dns01.hb.chinamobile.com | 192.168.20.2 | RFC 1918 |
| dns1.cootel.com.kh | 172.16.251.77 | RFC 1918 |
| dns2.cootel.com.kh | 172.16.251.88 | RFC 1918 |
| DNS3.ELETROPAULO.COM.BR | ::ffff:201.131.209.254 | IPv4-mapped IPv6 addresses |
| DNS4.ELETROPAULO.COM.BR | ::ffff:201.131.211.254 | IPv4-mapped IPv6 addresses |
| dns.unife.it | ::ffff:192.167.219.2 | IPv4-mapped IPv6 addresses |
| hertz.xl.net.id | 64:ff9b::ca98:fef6 | RFC 6052 |
| ibdxbns3.duhosting.ae | 10.198.18.10 | RFC 1918 |
| ibdxbns4.duhosting.ae | 10.198.18.14 | RFC 1918 |
| mail1.yogyaonline.co.id | 172.16.7.87 | RFC 1918 |
| ns1.exchangenext.net | 10.8.54.252 | RFC 1918 |
| ns1.netplus.co.in | 64:ff9b::6729:17c2 | RFC 6052 |
| ns2.exchangenext.net | 10.8.54.195 | RFC 1918 |
| ns2.netplus.co.in | 64:ff9b::6729:17c3 | RFC 6052 |
| ns5.tataidc.co.in | 64:ff9b::6708:2c05 | RFC 6052 |
| NSA.TIGO.COM.GT | 10.10.11.2 | RFC 1918 |
| socrates.xl.net.id | 64:ff9b::ca98:fef5 | RFC 6052 |
Last update: Sun 21 Oct 06:02:01 UTC 2018
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.