Blacklist checks whether any IP address, domain, or email server IP is blacklisted with over fifty-plus DNS-based blacklists (DNSBLs). It helps to identify IP reputation and email spam.
Note: It takes 20 to 40 seconds to check blacklists.
Check the blacklisted status of an IP, domain, or email server IP. Enter Domain/IP/Email address to check in the blacklist.
Several online tools and websites are free, and check that the domain, IP address, or email server IP is consequently listed with DNSBL or SURBL systems. Check your IP status or perform the IP blacklist lookup.
Note: We do not manage, run, or have any direct affiliation with any blacklist. We only provide a single platform to check a domain, IP, or email server IP address's status on third-party blacklists. We do not recommend using any specific blacklist or condone blacklists that require payment for removal. Including such blacklists is for completeness and should not support that blacklist's usage.
The Blacklist check tool checks whether the domain, IP address, or email server's IP is listed with DNSBL. Email system providers utilize that database to filter out spam emails before reaching the end users.
For example, if your company uses email marketing and sends thousands of emails to promote a new product, some receivers mark that email as spam. There is a high chance that your IP will be on the IP blacklist, which needs to be avoided.
IP address blacklisting is the process or method to filter out or block illegitimate or malicious IP addresses from accessing your network. It occurs when a web hosting company ultimately ignores your IP address. More precisely, any email you try to send is consequently blocked and filtered as spam.
One estimate concludes that email traffic consists of 80% of spam emails. That overwhelming amount of commercial emails leads to strict blacklisting practices to keep the inboxes spam-free. So one must check email for blacklist.
DNSBL is the first line of defense. DNSBL stands for Domain Name System Blacklist, the domain blacklist check that allows the administrator to block the messages from specific IPs with a history of sending spam messages. The list is based on Internet's Domain Name System, which converts the IP address into the domain name, and makes it much easier to understand.
Suppose a maintainer of a blacklist in the past has received any spam from a specific domain. It would include that domain’s IP in its blacklist. All the messages sent from that particular server would either be rejected/flagged by all the websites that use that blacklist to avoid spam.
There are dozens of DNSBLs available online for domain blacklist checks—each with its own rules and offensive categories to focus on. The most common nasty type is spam, but some blacklists focus more on hacking, malware, botnets, etc. The email administrators use these DNSBLs to check whether the incoming email is generated or originated from the blacklisted IP address.
SURBL is a list of websites that have appeared in unsolicited messages. It is the second line of defense, but not all spam filters can use it.
With time the spammers become pretty intelligent, and there is no proper way to catch every spam message. The email administrators use the SURBLs to scan the email messages' body text to extract any website address present and check it against the blacklists. If any address is found, the message will be treated as spam or handled accordingly per the instructions.
Note: Interestingly, the websites in unsolicited messages are more consistently used than the rapidly changing botnet IP addresses used to send most of them. If you are from an email marketing company, running an email advertisement, or from an email system administrator and your email server IP has been blacklisted, you must work with various DNSBLs and SURBLs to delist your IP address.
The process is simple.
A blacklist is a database of IP addresses believed to send spam. Emails from these IP addresses are either blocked or routed to the recipient's spam folder or handled accordingly.
Your IP may be in a single blacklist or multiple backlists. There is no centralized authority for that. Each blacklist is managed independently, and each has criteria for listing or delisting the IP address in its blacklist.
There are several reasons that your IP is on the blacklist.
The most common reason my IP address keeps getting blacklisted is that my IP address has been reported and consequently blacklisted for sending spam emails. If I am a home user, having my IP address on the blacklist would not make much difference. Otherwise, I must delist my IP address if I run a business or have a mail server. My system should be clean from viruses or malware, or my mail server must be configured correctly and pass the SMTP test through the SMTP tester.
Would you be interested in more DNS tools on DNS Checker? Why do not you try our WHOIS IPv6, Email Header Analyzer Online, and Ping IP Address? All the IP tools are top-notch and free!