What is the difference between Fox IO JA4+ vs RDFP?

**Fox IO JA4+**: Protocol-layer network fingerprinting suite for bot, proxy & malware detection. built by Fox IO. Core capabilities include TLS client fingerprinting (JA4), TLS server/session fingerprinting (JA4S), HTTP client fingerprinting (JA4H).. **RDFP**: Zeek Remote desktop fingerprinting script for fingerprinting Remote Desktop clients.. Both serve the Network Detection and Response market but differ in approach, feature depth, and target audience.

Is Fox IO JA4+ a good alternative to RDFP?

Fox IO JA4+ and RDFP serve similar Network Detection and Response use cases: both are Network Detection and Response tools, both cover Zeek, Fingerprinting. Key differences: Fox IO JA4+ is Commercial while RDFP is Free, RDFP is open-source. Review the feature comparison above to determine which fits your requirements.

Fox IO JA4+ vs RDFP (2026) | Compare Network Detection and Response Tools

Fox IO JA4+ vs RDFP: 2026 Comparison

Fox IO JA4+ is a commercial network detection and response tool by Fox IO. RDFP is a free network detection and response tool. Compare features, ratings, integrations, and community reviews side by side to find the best network detection and response fit for your security stack.

CST Verdict

Based on our analysis of core features, integrations, here is our conclusion:

RDFP

Security teams running Zeek for network visibility will find immediate value in RDFP for identifying unauthorized or outdated Remote Desktop clients on the wire, something most NDR platforms treat as noise rather than a detection signal. The script requires no additional infrastructure beyond existing Zeek deployments and costs nothing, making it a quick add to detect client-side RDP vulnerabilities that endpoint tools often miss. Skip this if your organization relies on application allowlisting or has already eliminated RDP from your environment; RDFP is tactical network hygiene, not a replacement for access controls.

Data verified Apr 2026