Free blacklist checker
Enter an IP address or domain to check it against 200+ email blacklists instantly. Know within seconds if you're listed where it matters.
Full blacklist monitoring with instant alerts is available in the ValidPeak dashboard.
Lists covered
200+ blacklists checked, including the ones that actually affect inbox placement:
Frequently asked questions
Which blacklists does this tool check?
The checker covers 200+ blacklists including Spamhaus SBL/XBL/PBL/DBL, Barracuda, SURBL, SpamCop, URIBL, MXToolbox Blacklist, and many others that ISPs and email providers query to filter spam.
What should I do if my IP or domain is blacklisted?
First, identify the root cause (spam complaints, malware, compromised account, or misconfigured server). Fix the underlying issue, then submit a delisting request directly to the blacklist operator. Most legitimate operators process requests within 24-72 hours.
How often should I check for blacklistings?
Active senders should check at minimum weekly. The best practice is continuous monitoring with instant alerts — a blacklisting on Spamhaus can block delivery to 3 billion mailboxes within minutes.