Free blacklist checker · Instant · No signup

Blacklist Checker

Check whether your sending IP or domain is blacklisted. Domain Doctor queries major DNSBLs and tells you where you are listed and how to get delisted.

19 checks per scan Results in seconds Free, no signup

The tool

What the Blacklist Checker checks

Blacklists (DNSBLs) are used by mail servers worldwide to block spam. If your sending IP or domain lands on a major list like Spamhaus, your email starts bouncing or landing in spam, often without warning.

Domain Doctor checks your IP against reputable IP blacklists and your domain against domain reputation lists, distinguishing a real listing from a list that is simply unavailable. A single Spamhaus SBL listing is serious; a transient spamtrap listing may clear on its own.

How it works

Check your domain in three steps

1Enter your domainType any domain into the box above and start the free scan. No signup, no software.

2We inspect it liveDomain Doctor queries major DNSBLs for your IP and domain, in real time from our servers.

3Get a clear verdictYou get a plain-language result, the exact records we found, and a concrete fix if anything is wrong.

What to watch for

Common Blacklist Checker problems

Sending IP listed on Spamhaus SBL/CSS
Domain listed on the Spamhaus DBL for abuse
Shared hosting IP tainted by another tenant
New IP with no reputation, throttled by receivers
Compromised account sending spam and getting you listed

VASTROX Email Deliverability

Get delisted and stay clean

We find the root cause of a listing, fix it, request delisting, and watch your reputation so it does not come back.

Root cause found and fixed
Delisting requests submitted for you
Ongoing reputation monitoring

Clean up my reputation Talk to VASTROX about email

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Questions

Frequently asked

Why is my IP blacklisted?

Common causes are sending spam (often from a compromised account), a shared IP tainted by another user, or a brand-new IP with no reputation. Fix the source first, then request delisting.

How do I get delisted?

Each blacklist has its own removal process. Resolve the underlying issue (secure accounts, fix authentication), then submit a delisting request on the list’s website. Spamhaus and others require the cause to be fixed first.

Does one blacklist listing matter?

It depends on the list. Spamhaus and Barracuda are widely trusted and a listing there has real impact. Smaller or spamtrap-driven lists carry less weight and often auto-expire.