What is a DNSBL blacklist?

A DNSBL (DNS-based Blackhole List) is a database of IP addresses known to send spam or engage in malicious activity. Mail servers query these lists to decide whether to accept or reject incoming email.

Why might my IP be blacklisted?

Common reasons include sending spam (intentionally or from a compromised device/server), running an open relay, being part of a botnet, or a previous owner of your IP being a spammer. Shared hosting IPs are more commonly blacklisted.

How do I get removed from a blacklist?

Each blacklist has its own removal process. Most have a web form at their website. You will need to identify and fix the underlying issue first (stop spam, secure the server), then submit a delisting request.

How long does blacklisting affect email delivery?

It depends on the blacklist. Some automatically delist after 24—48 hours if no new spam is detected. Others require a manual delisting request. During the period, emails from your IP may go to spam or be rejected.

How did my IP get blacklisted?

Common causes: your server was compromised and used to send spam, a shared hosting neighbor was blacklisted, your email volume suddenly increased triggering spam filters, or a high rate of bounces and spam complaints.

Blacklist Checker — Check if IP or Domain Is Blacklisted Free

Check if an IP address or domain is listed on major email blacklists. Checks Spamhaus, SpamCop, Barracuda, and more. Free, instant.

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Checks 7 major DNS blacklists (DNSBLs) using Google Public DNS. If your IP is listed, contact the blacklist provider to request removal.

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What is Blacklist Checker — Check if IP or Domain is Blacklisted?

A blacklist checker queries multiple DNS-based email blacklists (DNSBLs) — including Spamhaus, SpamCop, Barracuda, SORBS, and others — to check whether an IP address or domain is listed as a source of spam or malicious activity. Being blacklisted causes your email to be rejected or marked as spam by receiving mail servers. This tool lets you quickly identify which lists have flagged your IP or domain.

How to Use Blacklist Checker — Check if IP or Domain is Blacklisted

1Enter the IP address or domain you want to check.
2Click Check Blacklists to query all DNSBL databases.
3Review the results — green means clean, red means listed.
4For any listings, click the blacklist name to see the delisting process.
5Follow the delisting instructions to request removal.

Key Features

Checks 20+ major email blacklist databases
Spamhaus, SpamCop, Barracuda, SORBS, and more
Clear listed/clean status per blacklist
Links to delisting pages for flagged entries
Instant parallel queries

Benefits

Diagnose why email is being rejected or going to spam
Monitor your sending IP reputation proactively
Identify blacklistings after a security incident or spam complaint
Verify IPs are clean before using them for email campaigns

Why Use Irreva for Blacklist Checker — Check if IP or Domain is Blacklisted?

Diagnose why email is being rejected or going to spam

Monitor your sending IP reputation proactively

Identify blacklistings after a security incident or spam complaint

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Works on any device: desktop, tablet, or mobile.

Frequently Asked Questions

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