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unrecognised fingerprint

t13d0208h2_ec078ce24869_11a498df4e22

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 1.3ALPN h22026-07-23 → 2026-07-23
JA4
JA4_r
JA3
JA3_raw

this JA3 also appears under:

One JA3 mapping to several JA4s means the same cipher/extension set arrived under different TLS versions or ALPNs — the JA4 is the finer identity.

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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 203 connections: a deterministic stack. Libraries and command-line clients look like this.
reach
0.653 roams across 12 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

203
observations
12
domains reached
2026-07-23
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 1.3
ALPN (wire order)
h2
EC point formats
—
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(2)
  1. 00x1301TLS_AES_128_GCM_SHA256
  2. 10x00ffTLS_EMPTY_RENEGOTIATION_INFO
extensions(8)sorted
  1. 00x0000server_name (SNI)
  2. 10x000asupported_groups
  3. 20x000dsignature_algorithms
  4. 30x0010application_layer_protocol_negotiation (ALPN)
  5. 40x0029unknown (0x0029)
  6. 50x002bsupported_versions
  7. 60x002dpsk_key_exchange_modes
  8. 70x0033key_share

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

curves / groups(2)
  1. 00x001dx25519
  2. 10x0017secp256r1 (P-256)
signature algorithms(2)
  1. 00x0403ecdsa_secp256r1_sha256
  2. 10x0804rsa_pss_rsae_sha256

Reach — domains contacted

Top 12 of 12. Share is the fraction of this fingerprint’s observations reaching each name.