Methods XenForo Uses to Detect Suspicious IPs

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XenForo uses several methods to detect suspicious IPs and place them in a moderation queue. The exact algorithm hasn’t been revealed, but it is known to use:

1. Malicious IP Detection APIs
   XenForo integrates services like StopForumSpam, Project Honey Pot, and DNSBLs (blacklists of IPs used by bots and spammers).
2. Behavior Analysis
   If an IP has registered many accounts or attempts to post too quickly, XenForo flags it as suspicious.
3. HTTP Headers and Proxy Detection
   It detects the use of proxies and VPNs by analyzing headers like X-Forwarded-For and Via.
4. GeoIP Verification
   XenForo uses databases like MaxMind to determine the country of origin for an IP and compare it with lists of high-spam countries.
5. Suspicious Activity Heuristics
   If a user is using a bot-like browser or configuration (such as fake user agents), they may be put under review.

If you want to refine this system on your XenForo setup, you can:

• Enable StopForumSpam in the configuration.
• Use a VPN detection plugin.
• Set up custom rules in the XenForo admin panel.

If you need something more specific, let me know what type of spam you're receiving.