IP blacklist

An IP blacklist is a database or list of IP addresses that should be blocked from connecting to a protected system. These blacklists (aka blocklists, blackhole lists, or DNSBL's) are most commonly used by email receivers to screen out spam and other abusive emails flooding the Internet.

1. DNSBL is an acronym meaning a BlackList that is published in DNS, the Domain Name System.

• DNS Blacklist