IP Reputation

IP Reputation Check Online

The IP Reputation service on 101IP checks an IP address against eight key threat databases: CBL, Spamhaus XBL/SBL, Blocklist.de, SORBS, Barracuda, and others. Connection type flags (proxy, hosting, mobile) are also shown.

What the service checks

• CBL (Abuseat) — infected devices and open proxies;
• Spamhaus XBL — exploits and botnets;
• Spamhaus SBL — IPs involved in spam campaigns;
• Blocklist.de — IPs attacking servers (SSH brute force, FTP, web);
• Barracuda Reputation — email reputation of an IP.

When to check IP reputation

• Your server's email is landing in spam folders;
• You want to verify a newly leased IP is not "dirty";
• Analyzing suspicious activity in server logs;
• Security assessment before purchasing an IP block.

Frequently Asked Questions

• What should I do if my IP address is listed in Spamhaus or CBL?

  First find the root cause: your computer or server may be infected with malware sending spam, or you may have an open relay. After fixing the issue (run an antivirus scan, change passwords, disable the open relay), submit a delisting request on the relevant blocklist's website. The 101IP tool shows direct links to the removal pages for each list.

• Can an IP address from a hosting provider (data center) have a bad reputation?

  Yes, this is a common situation. If a hosting provider does not actively combat spam or attacks, their IP pools end up in blocklists. In that case the reputation problem is not your fault — contact your provider to request a new address or ask them to clean the pool. Use 101IP to confirm whether your IP is listed and assess the scope of the problem.

• How often should I check the reputation of a mail server's IP address?

  Daily checks are recommended, especially if you send important emails. Some blocklists update every hour, and an IP can be added after a single incident. Use 101IP.ru for quick checks — it takes less than a minute and helps you act promptly to restore email deliverability.