Domain Blacklist Check
Verify whether your domain is listed on major DNS-based blacklists (DNSBLs). A blacklisted domain can result in email delivery failures, reduced search engine rankings, and blocked web traffic.
What Is a Domain Blacklist?
A domain blacklist (also called a DNS-based Blackhole List or DNSBL) is a database of domain names that have been associated with spam, malware, phishing, or other malicious activities. Email servers and security systems query these lists to decide whether to accept or reject messages from a domain. Being listed on a blacklist can severely impact your email deliverability and online reputation.
Why Should You Check Your Domain?
Regularly checking your domain against blacklists helps you maintain a healthy sender reputation. If your domain is blacklisted, emails sent from your domain may be rejected or marked as spam by recipient mail servers. Early detection allows you to take corrective action — such as removing malware, fixing open relays, or requesting delisting — before significant damage occurs to your business communications.
Frequently Asked Questions
A domain blacklist check resolves your domain to its IP address, then queries multiple DNS-based blacklists (DNSBLs) to see if that IP is listed. Each blacklist maintains its own database of IPs associated with spam or abuse. A positive response indicates the IP is listed.
First, identify the cause — common reasons include compromised servers, spam activity, or shared hosting with a bad neighbor. Fix the underlying issue, then visit each blacklist's website to submit a delisting request. Most blacklists have automated delisting processes that take 24-48 hours.
This tool checks your domain against major DNSBLs including Spamhaus ZEN, SpamCop, Barracuda Central, SORBS, UCEPROTECT, PSBL, and CBL (Composite Blocking List). These are the most widely used blacklists by email servers worldwide.
It's recommended to check your domain at least weekly, or more frequently if you send high volumes of email. Consider using automated monitoring to get instant alerts when your domain or IP is listed on a blacklist.
Yes. In shared hosting environments, multiple domains share the same IP address. If any domain on that server sends spam or is compromised, the shared IP can be blacklisted, affecting all domains on it. This is called "bad neighbor" effect. Using a dedicated IP or VPS mitigates this risk.
IP blacklisting blocks traffic based on the sender's IP address, while domain blacklisting blocks based on the domain name itself (often checked via URI-based blacklists like SURBL or Spamhaus DBL). Both can affect email delivery. This tool resolves your domain to its IP and checks IP-based blacklists.