JA4 fingerprinting: a better way to identify clients
JA4 fingerprinting offers a more reliable method for identifying clients on the internet. By normalizing data from the TLS handshake, it creates consistent fingerprints that are harder to manipulate. This approach enhances bot detection and DDoS mitigation efforts by grouping similar clients together.
- ▪JA4 fingerprinting normalizes TLS handshake data to create stable client fingerprints.
- ▪Unlike previous methods, JA4 is less susceptible to manipulation by attackers.
- ▪Bunny.net has integrated JA4 into its systems for improved DDoS mitigation and bot detection.
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BlogAll PostsNewsPerformanceNetworkingTipsPrivacyAIJA4 fingerprinting: a better way to identify clientsPosted by: Joe ConnollyMarch 25, 2026There was a time when identifying traffic on the internet was relatively straightforward.An IP address and a User-Agent were usually enough to make a decision. If something looked wrong, you blocked it. Otherwise, you let it through.That approach no longer holds up.Today, a single automated client can appear as thousands of different users, rotating IPs, mutating headers, and mimicking real browsers with surprising accuracy. Botnets operate at scale across large networks, while headless frameworks and AI-driven agents make it even easier to blend in.At that point, what a client claims to be is no longer something you can rely on.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at bunny.net.
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