JA4

RU: JA4

A TLS client fingerprinting suite developed by FoxIO as the successor to JA3, using a sortable a_b_c format that is stable against TLS extension reordering (e.g. Chrome's randomization) and adds QUIC support. JA4 TLS fingerprinting is open-source (BSD 3-Clause); the wider JA4+ family of fingerprints covers HTTP, SSH, and other protocols.