Blocklist.de — Check, Delist & Monitor
Check if you're listed on Blocklist.de. Attack-focused DNSBL aggregating Fail2Ban reports for SSH brute force, web exploits, and mail abuse. Popular in European hosting.
Impact & Usage
Primarily adopted by European hosting providers and sysadmins running Fail2Ban. Not referenced by major email providers but indicates active security threats against your IP.
Typical users: Firewall operators, mail servers, and web hosting companies; popular in the European hosting community
What Gets You Listed
Aggregated reports from Fail2Ban and similar intrusion detection systems; IPs listed for SSH brute force, mail abuse, FTP attacks, and web exploits
How to Get Delisted
- Check your listing at blocklist.de/en/search.html by entering your IP address. Review the attack type and report count.
- Identify the attack source — Blocklist.de categorizes reports by type (SSH brute force, mail spam, FTP attack, web exploit, etc.).
- Fix the security issue: patch vulnerable services, change compromised credentials, block brute-force attackers with fail2ban or firewall rules, and close unnecessary ports.
- Submit a delisting request at blocklist.de/en/delist.html. Provide your IP and a brief description of the remediation steps taken. Verify removal with mxio Blacklist Check.
Expected Timeline
24-48 hours after delisting request (manual review)
Auto-delist: Automatic removal after reports stop; manual delisting via website form requires explanation of remediation steps taken
Common Causes
- SSH brute force attacks originating from your IP — typically indicates a compromised server or botnet participation
- Outbound spam detected by Fail2Ban honeypots and reporting nodes across the Blocklist.de network
- Web application attacks (SQL injection, path traversal, vulnerability scanning) launched from your IP
- FTP brute force or other automated login attacks targeting servers in the Blocklist.de network
Prevention Tips
- Deploy Fail2Ban or similar intrusion prevention to detect and block brute-force attacks against your own servers
- Disable password authentication for SSH and use key-based authentication exclusively
- Keep all server software, CMS platforms, and plugins updated to prevent exploitation
- Monitor outbound traffic for unusual connection patterns that may indicate compromise
Overview
Blocklist.de is a German-operated DNSBL that takes a different approach from most email-focused blacklists. Rather than monitoring spamtraps or analyzing email content, Blocklist.de aggregates attack reports from a network of servers running Fail2Ban and similar intrusion detection systems. When your IP is reported for SSH brute force attempts, FTP attacks, web exploits, or mail abuse across enough reporting nodes, it gets listed.
This attack-focused model means a Blocklist.de listing often indicates a genuine security compromise rather than a spam problem. Your server may be participating in a botnet, running a compromised web application that is launching attacks, or hosting malware that is conducting automated credential stuffing against other servers. The listing is a symptom of a larger security issue that needs immediate attention.
Blocklist.de is particularly popular in the European hosting community, where many server administrators contribute Fail2Ban reports to the network. Its adoption among major email providers is minimal — Gmail, Microsoft 365, and Yahoo do not reference it. However, you may see rejections from European hosting companies, smaller ISPs, and independently managed mail servers that use Blocklist.de as part of their filtering.
The delisting process is straightforward: submit a request at blocklist.de/en/delist.html with a description of the remediation steps you have taken. Requests are typically processed within 24-48 hours. However, if the underlying security issue is not fixed, your IP will be re-listed as soon as new attack reports come in from the network.
Monitor Your Blacklist Status
Get alerted the moment your IP or domain appears on a blacklist. Catch listings early, before they impact deliverability.
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