unrecognised fingerprint

t13d0207h2_ec078ce24869_1472448224a5

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 h22026-07-20 → 2026-07-23

JA4
JA4_r
JA3
JA3_raw

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Read

catalog identity

No ground-truth build has reproduced this hello yet — absence is not a verdict.

self-randomisation

fixed — one JA3 across 193 connections: a deterministic stack. Libraries and command-line clients look like this.

reach

0.447 roams across 15 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

193

observations

domains reached

2026-07-20

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)

00x1301TLS_AES_128_GCM_SHA256
10x00ffTLS_EMPTY_RENEGOTIATION_INFO

extensions(7)sorted

00x0000server_name (SNI)
10x000asupported_groups
20x000dsignature_algorithms
30x0010application_layer_protocol_negotiation (ALPN)
40x002bsupported_versions
50x002dpsk_key_exchange_modes
60x0033key_share

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

curves / groups(2)

00x001dx25519
10x0017secp256r1 (P-256)

signature algorithms(2)

00x0403ecdsa_secp256r1_sha256
10x0804rsa_pss_rsae_sha256

Reach — domains contacted

Top 15 of 15. Share is the fraction of this fingerprint’s observations reaching each name.