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unrecognised fingerprint

t13d2812h2_257f3020b3a2_cbb9361b6bf9

Multiple builds

A few stable builds share this JA4 — not per-connection randomisation, and not yet a named client.

TLS 1.3ALPN h2 · http/1.12026-07-19 → 2026-07-23
JA4
JA4_r
JA3
several builds share this JA4 under different JA3s — no single value is canonical.
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
multi-build · 2 JA3 — 2 JA3s over 3331 connections, but most repeat: a handful of stable builds sharing one JA4 rather than per-connection randomisation.
reach
0.460 roams across 30 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

3,331
observations
30
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 1.3
ALPN (wire order)
h2, http/1.1
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(28)
  1. 00x1301TLS_AES_128_GCM_SHA256
  2. 10x1302TLS_AES_256_GCM_SHA384
  3. 20x1303TLS_CHACHA20_POLY1305_SHA256
  4. 30xc02bTLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
  5. 40xc02fTLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
  6. 50xc02cTLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
  7. 60xc030TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
  8. 70xcca9TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305
  9. 80xcca8TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305
  10. 90x003cTLS_RSA_WITH_AES_128_CBC_SHA256
  11. 100x003dTLS_RSA_WITH_AES_256_CBC_SHA256
  12. 110xc009TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA
  13. 120xc013TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
  14. 130xc00aTLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA
  15. 140xc014TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
  16. 150xc023TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256
  17. 160xc024TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384
  18. 170xc028TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
  19. 180x009cTLS_RSA_WITH_AES_128_GCM_SHA256
  20. 190x009dTLS_RSA_WITH_AES_256_GCM_SHA384
  21. 200x002fTLS_RSA_WITH_AES_128_CBC_SHA
  22. 210x0035TLS_RSA_WITH_AES_256_CBC_SHA
  23. 220x0033TLS_DHE_RSA_WITH_AES_128_CBC_SHA
  24. 230x0039TLS_DHE_RSA_WITH_AES_256_CBC_SHA
  25. 240x0067TLS_DHE_RSA_WITH_AES_128_CBC_SHA256
  26. 250x006bTLS_DHE_RSA_WITH_AES_256_CBC_SHA256
  27. 260x009eTLS_DHE_RSA_WITH_AES_128_GCM_SHA256
  28. 270x009fTLS_DHE_RSA_WITH_AES_256_GCM_SHA384
extensions(12)sorted
  1. 00x0000server_name (SNI)
  2. 10x000asupported_groups
  3. 20x000bec_point_formats
  4. 30x000dsignature_algorithms
  5. 40x0010application_layer_protocol_negotiation (ALPN)
  6. 50x0015padding
  7. 60x0017extended_master_secret
  8. 70x0023session_ticket
  9. 80x002bsupported_versions
  10. 90x002dpsk_key_exchange_modes
  11. 100x0033key_share
  12. 110xff01renegotiation_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(8)
  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

JA3 variants

2 distinct JA3 hashes collapse into this one JA4.

#JA3JA3_rawobsshare
0771,4865-4866-4867-491…29-23-24,03,330100%
1771,49195-49199-49196-…29-23-24,01<0.1%

JA3 hashes preserve wire order, so a permuting client mints a new one per connection; JA4 sorts the same set, which is why they share one JA4. Every hash here belongs to this fingerprint — there is no per-JA3 page.

Reach — domains contacted

Top 15 of 30. Share is the fraction of this fingerprint’s observations reaching each name.