IP Blacklist

An IP Blacklist is a list of IP addresses marked as suspicious, malicious, or untrustworthy. Organizations, webmasters, and service providers use IP blacklists to block or limit access from these IP addresses. This helps protect networks, systems, and users from threats such as spam, malware, or cyberattacks.

Example

An online store has seen a series of fraudulent transactions from a specific IP address. To protect the business and its customers, the store adds that IP address to its IP blacklist. As a result, future requests from the blacklisted IP address are denied or flagged for further investigation, which reduces the risk of more fraudulent activity.