IP and Domain Blacklist Checker

ℹ️ About IP and Domain Blacklist Checker

This tool resolves a domain or host to its IP address and queries the major anti-spam DNS Blocklists (DNSBL) in real time. Verify if your mail server is blacklisted, which can cause outgoing emails to be blocked or marked as spam.

Features

Why Use IP Blacklist Check?

Monitor your mail server reputation and address email deliverability failure issues proactively.

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DNSBL Integration

Queries top anti-spam lists including Spamhaus, BarracudaCentral, SpamCop, and SORBS.

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IP Resolution

Automatically translates domain hostnames to their underlying public IPv4 addresses for scanning.

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Multi-Tab Preservation

View and compare listing histories across multiple IPs/Domains seamlessly.

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Proactive Delivery Protection

Ensure your outbound emails don't end up in receivers' junk or spam folders.

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UCEPROTECT Multi-Tier Check

Audits IP listing across local subnet ranges to detect broad network block risks.

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DNSBL Database Diversity

Performs checks across 14 major global spam registers in parallel.

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FAQ

Frequently Asked Questions

Find quick answers to common questions regarding IP blacklists and mail server deliverability audits.

A DNS-based Blackhole List (DNSBL) is a spam blocking database containing IP addresses known for publishing spam, malware, or server configuration vulnerabilities.

Typically due to sending unsolicited bulk emails, running an open mail relay, infected client endpoints sending outbound spam, or sharing IP subnets with active spammers.

You must resolve the underlying issue first (e.g. clean infections, fix open relays), then visit the specific DNSBL website (like Spamhaus or Spamcop) to submit a delisting request form.

Yes, a blacklisted mail server IP or domain can trigger reputation alerts on search crawlers and negatively impact SEO traffic.

A spamtrap is an inactive email address used by blocklists to capture spam. If your server sends mail to a spamtrap, it gets listed.