These people should run Split-horizon DNS;
| Host | Wrong IP address | Reason |
|---|---|---|
| dbserver21.x26.nl | 192.168.3.21 | RFC 1918 |
| dbserver41.x26.nl | 192.168.3.41 | RFC 1918 |
| dns01.kem.sibset.net | 10.6.0.251 | RFC 1918 |
| dns2.bestel.com.mx | 10.249.13.30 | RFC 1918 |
| ibd-syd-pve002.syd.netbydesign.nz | 10.40.254.52 | RFC 1918 |
| ns2.ip1.co.id | 172.16.212.50 | RFC 1918 |
| ns2.misp.ru | 10.77.247.1 | RFC 1918 |
| rdns01.yyz.d-zone.ca | 10.153.14.23 | RFC 1918 |
| service-static-149.34.134.mcm-telecom.com.mx | 192.168.1.1 | RFC 1918 |
| supermicro1.x26.nl | 192.168.2.71 | RFC 1918 |
| test-6c5q9w6nlcl.null-addr.net | 0.0.0.0 | Unconfigured |
| test-6c5q9w6nlcl.null-addr.net | :: | IPv6 Unconfigured |
| test-6xpd10s7lov.null-addr.org | 0.0.0.0 | Unconfigured |
| test-6xpd10s7lov.null-addr.org | :: | IPv6 Unconfigured |
| test-80tgsn4keox.null-addr.com | 0.0.0.0 | Unconfigured |
| test-80tgsn4keox.null-addr.com | :: | IPv6 Unconfigured |
| test-8xibrx4im7l.null-addr.net | 0.0.0.0 | Unconfigured |
| test-8xibrx4im7l.null-addr.net | :: | IPv6 Unconfigured |
| test-eg1wceyqxa.null-addr.net | 0.0.0.0 | Unconfigured |
| test-eg1wceyqxa.null-addr.net | :: | IPv6 Unconfigured |
| test-l0nyy1uq6c8.null-addr.org | 0.0.0.0 | Unconfigured |
| test-l0nyy1uq6c8.null-addr.org | :: | IPv6 Unconfigured |
| test-m1rn021nyok.null-addr.org | 0.0.0.0 | Unconfigured |
| test-m1rn021nyok.null-addr.org | :: | IPv6 Unconfigured |
| test-oo5j0n9m6j.null-addr.net | 0.0.0.0 | Unconfigured |
| test-oo5j0n9m6j.null-addr.net | :: | IPv6 Unconfigured |
| test-r2il0m2c2g.null-addr.com | 0.0.0.0 | Unconfigured |
| test-r2il0m2c2g.null-addr.com | :: | IPv6 Unconfigured |
| test-rwfl4c5clla.null-addr.com | 0.0.0.0 | Unconfigured |
| test-rwfl4c5clla.null-addr.com | :: | IPv6 Unconfigured |
| test-uxs41gk71kn.null-addr.com | 0.0.0.0 | Unconfigured |
| test-uxs41gk71kn.null-addr.com | :: | IPv6 Unconfigured |
| test-x4qtchodwu.null-addr.org | 0.0.0.0 | Unconfigured |
| test-x4qtchodwu.null-addr.org | :: | IPv6 Unconfigured |
| test-xjhivsv40op.null-addr.net | 0.0.0.0 | Unconfigured |
| test-xjhivsv40op.null-addr.net | :: | IPv6 Unconfigured |
| test-z0zvxphlkp.null-addr.com | 0.0.0.0 | Unconfigured |
| test-z0zvxphlkp.null-addr.com | :: | IPv6 Unconfigured |
| test-zuiynv0x0d.null-addr.org | 0.0.0.0 | Unconfigured |
| test-zuiynv0x0d.null-addr.org | :: | IPv6 Unconfigured |
| vop.net.helapc.cz | 172.16.232.1 | RFC 1918 |
| vps-13908437.sistecsistema.online | 10.0.2.15 | RFC 1918 |
Last update: Tue 4 Nov 07:02:03 UTC 2025
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;
// RFC 6052
64:ff9b::/96;
// Reserved for Documentation
2001:db8::/32;
// IPv6 Unique Local
fc00::/7;
// IPv6 Link local
fe80::/10;
// IPv6 Site local
fec0::/10;
// Your IPv6 address range(s)
Net/Mask
} 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.