If domain name does not exists the resolving name server should return NXDOMAIN status. For example, ninjaaamango.com does not exists, so any query sent to my ISP resolving name server should return NXDOMAIN. The following example should work on UNIX / Linux and Mac OS X command line option:
Host ninjaaamango.com not found: 3(NXDOMAIN)
DNS hijacking and NXDOMAIN
- Incompatible with most VPN software.
- Incompatible with most e-mail server that uses dns based anti-spam blakclists.
- Prevent the computer from resolving internal hostnames.
- Security problems such as Phishing and Pharming.