Enter your email address or sending domain below to run a real-time DNSBL blacklist check across major anti-spam databases (Spamhaus, SpamCop, Barracuda, SORBS) and verify your MX, SPF, and DMARC authentication.
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Enter your full email address (e.g., you@yourcompany.com) or domain name into the checker above and click "Check Blacklist Status". Our engine resolves your mail server IPs and queries major DNSBL blocklists plus your SPF and DMARC records in real time.
The #1 cause of domain and IP blacklisting is sending campaigns to unverified email lists that generate high hard-bounce rates (>2%) or hit recycled spam traps. Cleaning your email list with a 7-Layer Smart SMTP verifier before sending prevents DNSBL listings.
First, stop sending to unverified lists and ensure SPF, DKIM, and DMARC are properly configured. Then visit the specific blocklist’s removal portal (such as check.spamhaus.org or barracudacentral.org/lookups) to request delisting after fixing the root cause.
Domain Name System Blacklists (DNSBLs) and Real-Time Blackhole Lists (RBLs) publish real-time DNS zone files of IP addresses and sending domains caught transmitting to spam traps, compromised botnets, or unverified lists with high hard-bounce ratios. Over 90% of corporate mail gateways query Spamhaus and Barracuda before accepting an incoming SMTP connection.
When you enter a domain or IPv4 address into our Blacklist Checker, our resolver translates the target IP into reversed-octet query format (e.g., 42.100.51.198.zen.spamhaus.org) and queries major IP and URI blocklists in parallel. If a listing is found, we identify the exact return code (such as 127.0.0.2 SBL vs 127.0.0.4 XBL) so you can remediate the root cause and submit a clean delisting request.
| DNSBL / Blocklist Authority | Zone Queried & Scope | Delisting & Remediation Requirement |
|---|---|---|
| Spamhaus ZEN (SBL / XBL / PBL) & DBL | zen.spamhaus.org / dbl.spamhaus.org | Stop sending to unverified lists; verify FCrDNS PTR; request delisting at check.spamhaus.org |
| Barracuda Reputation Block List (BRBL) | b.barracudacentral.org | Fix compromised accounts or high bounce rates; submit removal at barracudacentral.org |
| Spamcop Blocking List (SCBL) | bl.spamcop.net | Driven by live spam trap hits; automatically expires 24h after spam/trap traffic stops |
| SORBS & UCEPROTECT Level 1 | dnsbl.sorbs.net / dnsbl-1.uceprotect.net | Audit outbound SMTP relay logs, enforce strict SPF -all, and scrub all CSV/.XLSX lists |