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The Blacklist Lookup tool is a web-based tool that allows users to check if a domain or IP address is listed on one or more blacklists. Blacklists are lists of domains or IP addresses that are known to be associated with spamming, malware, or other malicious activities. Blacklisting is a common practice used by email providers, web hosting companies, and other online services to block or filter out potentially harmful or unwanted traffic.