The Abusix Authbl Blocklist is a real-time IP-based blacklist that helps prevent authentication attacks by listing compromised hosts for a short 12-hour period, making it a highly responsive blocklist for preventing account takeovers and brute force attempts.
The Abusix Authbl Blocklist is a real-time IP-based blacklist used for outbound mail and to protect authentication services. It is a specialized subset of a larger exploit list maintained by Abusix, focusing only on hosts that have been detected engaging in malicious activity within the last 12 hours. This shorter listing duration helps minimize the chance of false positives, which can occur when a dynamic IP address is reassigned to a new user.
This particular blocklist (blacklist) is designed to help system administrators prevent account compromises and secure services. It is effective against dictionary attacks, brute-force attempts, and unauthorized logins using phished credentials. The list contains IP addresses from various sources, including:
Technically, the Abusix Authbl Blocklist supports both IPv4 and IPv6 addresses. When an IP address is queried and found on the list, it returns the code 127.0.0.4. System administrators can integrate this blacklist into services like Postfix to reject mail from compromised accounts or use it as an access control list for web servers, SSH, and other network services.
Abusix, a leader in network abuse management and email security, operates the Abusix Authbl Blocklist. The company positions itself as more than a simple blocklist provider, offering a suite of solutions to protect networks and improve internet safety. Their core vision is to stop cybersecurity threats before they reach end-users by focusing on email and network traffic, which are the primary vectors for attacks.
Abusix provides threat intelligence to Internet Service Providers, hosting companies, and other large network operators to help them secure their infrastructure. They emphasize proactive defense and automation to handle security risks and abuse cases efficiently.
The removal process for this blacklist is straightforward. Abusix provides a self-service portal for delisting, but you must first address the underlying issue that caused the listing. Common causes include compromised user accounts, infected devices sending spam, or poor mailing list hygiene. Delisting is free, though it requires creating an account to prevent misuse of the delisting system.
To request removal, follow these steps:
Delist requests are processed immediately. While the change is instant for DNS queries, it may take up to five minutes for the removal to propagate to partners who sync the zone file.
The impact of a listing on the Abusix Authbl Blocklist is considered medium. This blocklist is not primarily designed to stop all incoming email from an IP address. Instead, its main function is to prevent authentication from potentially compromised or malicious hosts.
If your IP is on this blacklist, you may experience email delivery failures if a mail server uses it to check authenticated users before they can send mail. More broadly, the listing could prevent you from logging into services that use this blacklist for protection, such as web panels, IMAP servers, or SSH, effectively blocking access to your own accounts from that IP.
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