An IP blacklist is a list of IP addresses that have been identified as being associated with malicious activity. These lists are used by various network security tools, such as firewalls and intrusion detection systems, to block traffic from known bad actors.
IP blacklists are an important tool for protecting networks from a variety of threats, including spam, malware, and phishing attacks. By blocking traffic from known malicious sources, IP blacklists can help to reduce the risk of these attacks being successful.