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IP addresses are a feature that a server looks for before allowing a visitor to access a website. There are over 160+ anti-spam databases available to look for spam IP addresses. This tool scans the domain name with hostname to IP tools, and then it checks the real IP of a domain for spam. A website could get on a blacklist if the site owner decided to send emails about a brand new product to many people. If someone is offering to sell a domain to you, you must check if that domain gets blacklisted.
Search engines use the IP address to blacklist a website. There are so many blacklist site lists that it becomes impossible for a site owner to check. It is possible to use the Free Google Malware Checker Tool to check the Google blacklist list.