Blacklist Lookup
Check if your mail server or domain is blacklisted or not. Blacklist Lookup helps you determine if your server is blacklisted on various DNS or not.
Free Blacklist Lookup & IP Reputation Checker
Test server IPs and domain names against over 100 DNS-based spam blacklists and email reputation databases.
Quick Answer & Overview
A blacklist lookup queries major DNS-based blacklists (DNSBL, RBL, Spamhaus, SURBL) to determine whether a domain or server IP address is flagged for spam or malware. Clean listings ensure reliable email deliverability and search engine trust.
Enter Server IP or Web Domain
Provide your outbound mail server IP address (e.g. 192.0.2.1) or sending domain name.
Query 100+ Global DNSBL Zones
Our scanner performs parallel DNS queries across major reputation registries (Spamhaus, Barracuda, SORBS).
Inspect Blacklist Detection Badges
Review green pass badges or red listing warnings indicating specific blacklists that flag your host.
Initiate Delisting Procedures
Follow official removal guidelines provided for each active blacklist to restore deliverability.
Quick Answer: What is a Blacklist Lookup Tool?
A Blacklist Lookup Tool tests a mail server IP or website domain against over 100 DNS-based spam blacklists (DNSBL/RBL like Spamhaus, SORBS, and Barracuda). Being listed on a blacklist harms email deliverability, sends notifications to junk folders, and damages domain sender reputation.
Prominent DNSBL Blacklists Reference
| Blacklist Name | Focus Area | Global Impact Level | Delisting Process |
|---|---|---|---|
| Spamhaus (ZEN / SBL / XBL) | Verified spammers, botnets, and infected hosts. | Critical (Used Worldwide) | Self-service removal lookup form after fixing root issue. |
| Barracuda (BRBL) | High-volume spam and malicious IP nodes. | High Enterprise Impact | Requires manual ticket submission on Barracuda Central. |
| SpamCop | Real-time spam trap hits and user reports. | Moderate Impact | Automatic delisting 24–48 hours after spam stops. |
Frequently Asked Questions
What is a DNS-based blacklist (DNSBL)?
A DNSBL (DNS-based Blackhole List) or RBL (Real-time Blackhole List) is a software database that publishes lists of IP addresses and domains suspected of transmitting spam, hosting malware, or running compromised open relays.
Why is my IP address or domain blacklisted?
Common triggers include infected websites sending automated spam emails, sending bulk marketing emails without double opt-in, sharing an IP with a spammer, or lacking proper SPF, DKIM, and DMARC authentication.
How does being blacklisted affect my business?
Blacklisted mail servers experience severe email delivery failures, with transactional receipts and customer emails bouncing or getting sent straight to spam folders.
How do I remove my IP from a blacklist?
First resolve the root cause (quarantine malware, secure email accounts, configure SPF/DKIM). Then visit the specific blacklist website (e.g., Spamhaus.org or BarracudaCentral.org) and submit an official delisting request.
Does email blacklisting hurt Google SEO rankings?
While email blacklists do not directly lower Google web search rankings, security-based blacklists (like Google Safe Browsing) will immediately trigger organic search penalties and browser warnings.
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