IP Reputation Check

Check whether an IP address (or domain) is listed on major spam blacklists — a blacklisted sending IP blocks delivery no matter how correct your SPF, DKIM, and DMARC setup is.

100% Free 15 Blacklists Checked Instant Results

Check Blacklist Status

Enter the sending mail server's IP address for the most accurate result — a domain will be resolved to its current A record automatically.

Secure by designYour IP address is processed instantly over an encrypted connection and never stored on our servers.

Encrypted in transitSubmitted over HTTPS/TLS — nothing is sent in plain text.

Never storedThe IP you check and its results are not saved to any database or log.

No third-party sharingYour data is never shared with ads, trackers, or outside services.

Processed instantlyChecked on request and discarded immediately after the response.

About IP Reputation Check

What Is an IP Reputation Check?

This tool checks whether an IP address has been flagged on major spam and abuse blacklists — useful for diagnosing email deliverability problems traced to a specific sending IP, or vetting an IP before using it for outbound mail.

How to Use This Tool

Enter the IP address you want to check
Click Check
Review the results across 15 major blacklist sources

Key Features

Checks 15 major DNSBLs at once
Clear listed/not-listed status per source

Who Uses This Tool

Email administrators diagnosing deliverability issues traced to a specific IP. System administrators vetting a new server's IP before putting it into production use for mail.

Frequently Asked Questions

What should I do if my IP is blacklisted?
Identify and fix the underlying cause, then follow each listing blacklist's specific delisting request process.

Is this tool free?
Yes, checking IP reputation is completely free.

Frequently Asked Questions

Why is my IP blacklisted if I never sent spam?

Shared hosting and VPS providers reuse IP addresses — you can inherit a bad reputation from a previous tenant. A compromised server, an open relay, or one misconfigured application on a shared IP can also get an entire address blacklisted.

I got delisted but I'm listed again a few days later.

This almost always means the underlying cause wasn't actually fixed — a compromised script, an open relay, or continued spam-like sending behavior. Delisting without fixing the root cause is temporary at best.

Does a clean result guarantee good deliverability?

No — it rules out one common cause of blocked delivery, but SPF, DKIM, DMARC, content filtering, and sender reputation with individual mailbox providers (like Gmail's own internal reputation system) all matter too.

Why does this tool check fewer than 10 blacklists?

Some major blacklist operators, notably Spamhaus, restrict public DNS queries from shared hosting infrastructure and require a paid data feed for reliable high-volume access. This tool only reports blacklists it can query reliably, rather than risk showing an inaccurate "clean" result.

Should I check my domain or my mail server's IP?

Check the actual sending IP of your mail server. Blacklists track IP reputation, not domain reputation — if your website and mail server use different IPs (common with hosted email services), check the mail server's IP specifically.

How often should I check?

If you're seeing delivery problems or a sudden drop in email engagement, check immediately. Otherwise, a periodic check (monthly, or after any server-level incident) is reasonable for ongoing monitoring.