In bind and most dns servers the ip reverse registers are saved in different zones than the domains. There are times when you get an ip address that was previou

In bind and most dns servers the ip reverse registers are saved in different zones than the domains. There are times when you get an ip address that was previously used and still has the reverse dns configured (usually ISPs cancel the domain or server but don't delete the reverse ip info). It's possible but not too likely to happen.