Blacklist Checker
Check if a domain or IP is listed on major email blacklists (DNSBLs).
Why Check Blacklists?
Stay on top of your domain and IP reputation to ensure reliable email delivery.
12 Major Blacklists
Checks your IP against 12 of the most widely used DNS-based blacklists including Spamhaus, Barracuda, and SpamCop.
Instant Results
All blacklists are queried in parallel with a 5-second timeout, giving you results in seconds rather than minutes.
DNS-Based Lookup
Uses the standard DNSBL protocol — no API keys or third-party accounts required. Pure DNS queries for accurate, real-time results.
Email Deliverability
Being blacklisted can cause your emails to land in spam or be rejected entirely. Regular checks help you catch issues early.
Response Time Tracking
See how long each blacklist takes to respond, helping you identify slow or unresponsive DNSBL servers.
How It Works
Three simple steps to check your domain against all major blacklists.
Enter Your Domain
Type the domain name you want to check. We resolve it to its IP address automatically.
Query Blacklists
Your IP is checked against 12 major DNS-based blacklists simultaneously using reverse DNS lookups.
Review Results
See a clear breakdown of which blacklists your IP is clean on and which ones have it listed, with response times.
Related Tools
More tools to investigate your domain and server configuration.
Frequently Asked Questions
Common questions about blacklists, delisting, and email deliverability.
What is a DNSBL (DNS-based Blacklist)?
A DNSBL is a list of IP addresses published via DNS that are known to send spam or malicious email. Mail servers query these lists in real time to decide whether to accept, reject, or flag incoming messages. If your IP is on one of these lists, your emails may be blocked or sent to spam folders.
How do I get delisted from a blacklist?
Each blacklist has its own delisting process. Most require you to visit their website, look up your IP, and submit a removal request. Before requesting delisting, make sure the issue that caused the listing (e.g., compromised server, open relay, spam sending) has been resolved. Some lists like Spamhaus have automated expiry if no further abuse is detected.
How does being blacklisted affect my email delivery?
When your IP or domain appears on a blacklist, receiving mail servers may reject your emails outright, send them to the spam folder, or apply a higher spam score. Major email providers like Gmail, Outlook, and Yahoo all check multiple blacklists. Being listed on even one major list like Spamhaus can severely impact deliverability.
How often should I check my blacklist status?
It depends on your email volume and risk profile. For businesses that rely heavily on email, weekly checks are recommended. For high-volume senders or those who have been listed before, daily monitoring is advisable. Early detection allows you to address the root cause quickly and request delisting before significant delivery impact occurs.