Gatekeeper is a lightweight, highly optimized Minecraft plugin that defends your server from VPNs, proxies and abusive ISP ranges. It combines fast local ASN analysis with optional external IP checks to give you a multi-layered protection system that’s tuned for high connection volumes.

Requirements:

• Java 8 or later
• Server version 1.8 - 1.21.10

Key features

• Block VPNs and proxies (local + external layered detection)
• ASN / ISP blocking (block entire provider ranges)
• External IP verification via configurable APIs (fallback shield)
• Country detection and country-based rules
• Per-IP player limit (prevent account sharing and sockpuppets)
• Connection rate limiting (protect against rapid reconnects / attack vectors)
• Extremely lightweight and optimized for high concurrent connections
• Local ASN analysis — proxy detection in under 1 millisecond for most checks
• Configurable priorities and easy integration with permission systems

Why choose Gatekeeper?
Gatekeeper combines speed and depth: local ASN analysis gives instant verdicts with tiny CPU cost, and the external API layer catches anything missed locally. That means fewer false negatives, minimal server load, and industry-grade features without a paywall.

Quick install

1. Drop Gatekeeper.jar into your server's plugins folder.
2. Restart the server to generate the default config.
3. Edit config.yml to add API keys, ASN lists, rate limits and country rules.
4. Reload or restart.

Recommended for

• Large public servers and networks
• Hubs and proxy-prone communities
• Admins who want advanced blocking (ASN, country, rate limits) with minimal resource use