About IPLogs

Why it exists

Commercial VPN-detection APIs are expensive and usually return a single opaque score with no visibility into which signals fired. That makes them hard to debug when a real user trips a false positive, and dangerous to trust when the same vendor sells VPN services on the side.

IPLogs started as the reference implementation for a research project on modern censorship-evasion detection. Every detection verdict we return cites the exact signals that produced it and is grounded in peer-reviewed network security research. The public API is free for small and medium use so hobbyists and indie developers can build on it.

What makes it different

• Transparent signals. Every API response includes the full list of checks that were evaluated, which ones matched, and the weight each contributed to the final score. No black-box verdicts.
• Research-backed. Detection layers are grounded in published network-security research: SNITCH (NDSS 2025), cross-layer RTT analysis (NDSS 2025), JA3/JA4 fingerprinting, REALITY cert-switch fingerprinting, and public-sector firewall studies (China GFW, Russia TSPU, Iran filtering).
• No tracking, no ads. No cookies. No third-party analytics. No monetization of user IP lookups. The only data collected is what's required to rate-limit abuse.
• Free public API. No signup, no key, no quota for reasonable use. POST to iplogs.com/v1/check and you're live.

How it compares

Contact

API questions, bug reports, and feature requests: admin@iplogs.com. Public API README on GitHub.