Free Blacklist Checker

Check whether an IP address or domain is on email blacklists, free and with no sign-up. Enter an IP or domain and the tool checks it against major DNS blacklists, showing which lists, if any, have it flagged. Useful for diagnosing email delivery problems and monitoring your sending reputation. No account needed.

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The free Blacklist Checker tells you whether an IP address or domain appears on email blacklists. Enter an IP or domain and the tool checks it against a set of major DNS blacklists, then shows which lists, if any, have it flagged. It is a fast way to find out if a blacklisting is behind email delivery trouble. It is free and needs no account.

DNS blacklists, or DNSBLs, are databases of IP addresses and domains associated with spam or abuse. Mail servers consult them to decide whether to accept or reject incoming mail, so being listed on one can cause your messages to be blocked or sent to spam. Checking your status is the first step in diagnosing and fixing a reputation problem.

How to Check a Blacklist

  1. Enter an IP or domain. Type the address you want to check.
  2. Check. The tool queries the blacklists for that address.
  3. Read the results. See which blacklists, if any, have the address flagged, and which report it as clean.

What the Results Mean

A clean result across the lists means the address is not currently flagged by the blacklists checked, which is what you want for good email delivery. If an address is listed, it means one or more blacklists have associated it with spam or abuse, which can hurt deliverability. Being listed is not always deserved: shared hosting, a previously abused IP, or a temporary issue can lead to a listing, and false positives do happen. If you find a listing, most blacklists provide a way to request removal once the underlying issue is resolved.

It is also worth noting that this tool checks the specific blacklists it queries, which cover the major and widely used ones, rather than every blacklist that exists. A clean result here is a strong sign, though a particular mail provider could use a list not included.

When to Check a Blacklist

  • Diagnosing email problems. Find out if a blacklisting is why your mail is not being delivered.
  • Monitoring your reputation. Keep an eye on your sending IP's standing over time.
  • Vetting a mail server. Check the reputation of an IP before sending from it.
  • After a security issue. Confirm whether a compromised server has been listed.

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You can also resolve a domain to its IP, look up its DNS records, or check its hosting.

Frequently Asked Questions

Frequently Asked Questions (FAQs) is a list of common questions and answers provided to quickly address common concerns or inquiries.

Is the Blacklist Checker free?

Yes, completely free with no sign-up. Check as many addresses as you need.

What does it mean to be blacklisted?

It means a DNS blacklist has associated your IP or domain with spam or abuse. Mail servers consult these lists, so a listing can cause your email to be blocked or sent to spam.

Does it check every blacklist?

It checks the major, widely used DNS blacklists it queries, not every blacklist in existence. A clean result is a strong sign, though a specific mail provider could use a list not included here.

Can a listing be a mistake?

Yes. Shared hosting, a previously abused IP, or a temporary issue can cause a listing, and false positives happen. Most blacklists let you request removal once the underlying issue is fixed.

How do I get removed from a blacklist?

Resolve the underlying issue, such as securing a compromised server or stopping the source of spam, then use the delisting process the specific blacklist provides.

Should I check an IP or a domain?

You can check either. For email delivery issues, the sending IP address is usually the most relevant to check.
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