Blacklist Check Tool
Check whether a domain or IP address appears on common blacklists that can affect email delivery and reputation.
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This blacklist checker scans major public blacklists to determine whether a domain or IP address has been flagged for spam, abuse, or other suspicious activity. Being listed on one or more blocklists can lead to email delivery problems, reduced trust from network providers, and in some cases ranking or reputation issues. By entering a domain or IP you receive a quick overview of its status across multiple sources. This is valuable for mail server administrators, hosting providers, marketers managing newsletter campaigns, and anyone who suspects that legitimate messages are being rejected or filtered. The tool helps you detect reputation problems early so that you can take corrective actions such as cleaning mailing lists, tightening security, or requesting delisting where appropriate.