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Blacklist / DNSBL Checker

Scan your IP address or domain across dozens of major anti-spam DNSBL databases. Identify reputation blocks, detect compromised mail servers, and safeguard email deliverability.
✓ Free✓ No signup✓ Privacy first✓ Runs in your browser
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Enter an IPv4 address or domain above to test reputation against 15+ authoritative DNSBL spam and malware blacklists via secure DNS-over-HTTPS.

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DNSBL Provider Zone Host Listing Status Response Code Category

Blacklist & DNSBL Checker · 100% Client-Side Anycast DoH · ToolPremier

How it works

Get it done in three steps

1. Enter IP address or domain

Input your mail server public IP address or apex domain into the lookup field.

2. Query global DNSBL databases

Initiate the multi-source query to check reputation status across major spam monitoring lists simultaneously.

3. Inspect listing details

Review listing statuses, delisting instructions, and threat categories to clean up your mail server standing.

FAQ

Common questions

A DNSBL (DNS-based Blackhole List) is a public registry that tracks IP addresses and domains suspected of distributing spam, malware, or abusive traffic. Internet service providers and corporate mail gateways consult these databases before delivering incoming messages to recipient inboxes. If your sending IP is listed, your outbound emails may be rejected with bounce codes or redirected automatically into junk folders.
An IP address can be blacklisted for several reasons, including sending unauthenticated bulk emails, high recipient complaint rates, compromised email accounts sending phishing messages, or poor list hygiene. Furthermore, sharing a cloud server or shared hosting IP with another sender who abused sending privileges can result in collateral blacklisting. Running regular audits helps you identify these listings before deliverability collapses.
Once you identify which blacklist has flagged your IP, visit that provider’s official delisting page and follow their removal procedure. Before requesting delisting, resolve the underlying cause by fixing compromised credentials, updating SPF/DKIM/DMARC records, and halting bulk mail delivery. Many reputable lists provide automatic or self-service delisting once malicious activity ceases.
The checker queries public DNSBL endpoints via client-side DNS queries and does not register, publish, or record your searched addresses. Your audit queries remain confidential, and the lookup itself will never trigger a new blacklist event. Refreshing or closing the webpage removes all search results from local browser memory.

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About the Blacklist / DNSBL Checker

The Blacklist / DNSBL Checker is a crucial network diagnostics utility for system administrators, IT managers, and email senders. It queries prominent reputation registries to detect delivery blocks that prevent business emails from reaching client inboxes. By providing instant visibility into server health, the tool enables teams to remediate security issues and restore trustworthy sender reputations.

Benefits

  • Protect email deliverability — catch spam listings early to prevent customer invoices and marketing communications from bouncing.
  • Query dozens of lists at once — test your sending IP across major DNSBL registries simultaneously in one straightforward check.
  • Detect compromised servers — spot unusual spam flags indicating compromised mail accounts or unauthorized relaying activity.
  • Expedite delisting procedures — access direct provider details to submit remediation requests and clean your sender reputation.

Privacy

All blacklist queries run via secure public lookup channels within your browser session, and no queried hostnames or IP addresses are logged.