Free Domain Blacklist Checker Spamhaus DBL Lookup
Domain blacklists kill deliverability overnight. This checker queries the Spamhaus Domain Blocklist (DBL) live the list major mailbox providers consult. A listing here means your links and domain are being blocked across the ecosystem.
How this check works
- 01
Your domain is looked up against the Spamhaus DBL zone via DNS-over-HTTPS.
- 02
A positive answer (127.0.1.x) means listed; NXDOMAIN means clean.
- 03
Listings are explained with the standard remediation path.
How to fix common problems
Domain is listed
Stop sending immediately. Find the cause (compromised forms, scraped lists, spam complaints), fix it, then request delisting at spamhaus.org with evidence of the fix.
Prevent future listings
Send only to verified, targeted lists; keep complaint rates under 0.1%; never include link shorteners in cold email.
Example
A clean domain returns NXDOMAIN (not listed). A listed domain returns 127.0.1.2 meaning DBL-listed, and most receivers are rejecting or junking its mail.
FAQ
- What is the Spamhaus DBL?
- The Spamhaus Domain Blocklist tracks domains involved in spam, phishing, and malware. Mailbox providers consult it when filtering a listing affects every email containing your domain.
- How do I get off a blacklist?
- Fix the root cause first (list quality, complaints, compromised account), then submit a delisting request on the blocklist's site. Delisting without fixing the cause gets you relisted fast.
- Does this check IP blacklists?
- This checks domain listings. IP blacklists matter most if you run dedicated sending IPs most senders on Google/Microsoft/Instantly infrastructure inherit managed IP reputation.
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