Check To See If Your IP is blacklisted on major DNSBL servers

If you’re concerned that your email is not getting to your subscriber’s inbox, there’s a chance that the IP address you’re sending from has been blacklisted. You can enter the IP Address that you’re sending your email from, or you can enter the domain or subdomain you’re sending from and this form will resolve it.


Check IP

    What’s A DNSBL Server?

    DNSBL stands for Domain Name System (DNS) based Blackhole List. It is a method used to identify and block email messages that are sent from IP addresses that are associated with spam, malware, and other forms of unwanted or malicious activity.

    DNSBLs are used by email servers to check the IP address of incoming email messages against a database of known spam sources. If the IP address is found on a DNSBL, the email message is blocked or flagged as spam.

    A DNSBL is essentially a database of IP addresses that are known to be associated with spam and other unwanted activity. When an email message is received, the email server checks the IP address of the sender against the DNSBL, and if the IP address is listed, the message is blocked or flagged as spam.

    This helps to reduce the amount of spam that is received by users and helps to keep email inboxes free of unwanted messages.

    How Do IP Addresses Get Blacklisted for Email?

    IP addresses can get blacklisted with DNSBL servers for a variety of reasons, but most commonly it is due to sending spam or hosting malware or phishing sites.

    Some DNSBLs also list IP addresses that have been compromised by hackers and are being used to send spam without the knowledge of the legitimate owner of the IP address.

    Additionally, some DNSBLs may list IP addresses that have been assigned to a dynamic IP address pool and have been previously used by a spammer or other malicious actor. This is known as a poor reputation IP address.

    How Do You Get Your IP Address Delisted From A DNSBL?

    If an IP address is listed on a DNSBL, it means that the IP has been identified as a source of spam or other malicious activity. If an IP address is listed on a DNSBL, the first step is to identify the source of the problem. This could be due to an infected computer on the network, a compromised email account, or an open relay on a mail server. Once the source of the problem is identified, it should be addressed and cleaned up. Once the problem has been resolved, the IP address can be delisted by requesting a delisting from the DNSBL or by contacting the system administrator of the DNSBL. It is also recommended to monitor the IP address to ensure it does not get listed again.

    Do you have a DNSBL server you’d like me to add to this list? Let me know!

    And, if you’re having difficulty with monitoring and repairing your sending reputation, feel free to reach out to my firm, Highbridge. We are deliverability experts and can assist you.

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