Blocklist check
Is your IP blacklisted? Enter an IP to check it live against email blocklists (DNSBLs), or a domain to check threat-intelligence lists — free, no signup.
Works on all devices. Blocks ads and trackers. Replaces your default resolver.
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What is a blocklist check?
Email blocklists (DNSBLs) are anti-spam lists that mail servers consult before accepting a message. If your IP is listed, your email may be rejected or sent to spam — common after a malware infection, a misconfigured mail server, or inheriting a "dirty" IP. Entering an IP here checks it live against several reputable DNSBLs (SpamCop, Barracuda, UCEPROTECT and more).
Threat-intelligence lists are a different thing: curated feeds of domains and IPs observed serving malware, phishing, or spam. A hit on several at once is worth investigating before you trust a host. A single listing isn't a verdict — feeds lag, and shared hosting means an innocent domain can share an IP with a bad one. New here: Is my IP blacklisted? DNS blocklists explained.