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unrecognised fingerprint

t12d0609h2_39a52dd9ae43_b39be8c56a14

Deterministic client

One JA3 across every connection — a deterministic stack, the shape of a library or command-line client, with no catalogue name yet.

TLS 1.2ALPN h22026-07-19 → 2026-07-23
JA4
JA4_r
JA3
JA3_raw

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catalog identity
No ground-truth build has reproduced this hello yet — absence is not a verdict.
self-randomisation
fixed — one JA3 across 20 connections: a deterministic stack. Libraries and command-line clients look like this.
reach
0.511 roams across 4 domains — spread is how evenly, not how many.

Spread measures reach, not intent: it can’t tell one scraper visiting 500 domains from 500 people visiting one each. Stability is a claim about software — whether the stack is deterministic — nothing about who runs it.

Footprint

20
observations
4
domains reached
2026-07-19
first seen
2026-07-23
last seen

ClientHello anatomy

The underscore groups of JA4_r are the raw cipher suites · extensions · signature algorithms behind the hash.

TLS version
TLS 1.2
ALPN (wire order)
h2
EC point formats
0x0000
Post-quantum key share
absent

The post-quantum key share is a structural fact about the hello, not a verdict — GREASE values are flagged the same neutral way.

cipher suites(6)
  1. 00xc02bTLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
  2. 10xc02fTLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
  3. 20xc02cTLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
  4. 30xc030TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
  5. 40xcca9TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305
  6. 50xcca8TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305
extensions(9)sorted
  1. 00x0000server_name (SNI)
  2. 10x0005status_request (OCSP)
  3. 20x000asupported_groups
  4. 30x000bec_point_formats
  5. 40x000dsignature_algorithms
  6. 50x0010application_layer_protocol_negotiation (ALPN)
  7. 60x0017extended_master_secret
  8. 70x0023session_ticket
  9. 80xff01renegotiation_info

Stored sorted — under one JA4 the wire order varies by construction, so no single order is “the” order.

curves / groups(3)
  1. 00x001dx25519
  2. 10x0017secp256r1 (P-256)
  3. 20x0018secp384r1 (P-384)
signature algorithms(9)
  1. 00x0403ecdsa_secp256r1_sha256
  2. 10x0804rsa_pss_rsae_sha256
  3. 20x0401rsa_pkcs1_sha256
  4. 30x0503ecdsa_secp384r1_sha384
  5. 40x0805rsa_pss_rsae_sha384
  6. 50x0501rsa_pkcs1_sha384
  7. 60x0806rsa_pss_rsae_sha512
  8. 70x0601rsa_pkcs1_sha512
  9. 80x0201rsa_pkcs1_sha1

Reach — domains contacted

Top 4 of 4. Share is the fraction of this fingerprint’s observations reaching each name.