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unrecognised fingerprint

t13d1917h2_4d8ed5baf28e_3cbfd9057e0d

Randomising client

Reshuffles its own ClientHello per connection — browser-shaped behaviour, but no catalogue build has reproduced this exact hello.

TLS 1.3ALPN h2 · http/1.12026-07-19 → 2026-07-23
JA4
JA4_r
JA3
permutes its ClientHello, so every connection emits a fresh JA3 — none represents it.
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
randomising · 15 JA3 — 79% of connections presented a JA3 never seen before for this client — it reshuffles its own ClientHello. Chrome has permuted extension order since version 110.
real-browser tell
Advertises X25519MLKEM768 (0x11ec), a post-quantum key share only current real browsers send.
reach
0.750 roams across 8 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

19
observations
8
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
present (X25519MLKEM768)

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(19)
  1. 00x1301TLS_AES_128_GCM_SHA256
  2. 10x1303TLS_CHACHA20_POLY1305_SHA256
  3. 20x1302TLS_AES_256_GCM_SHA384
  4. 30xc02bTLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
  5. 40xc02fTLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
  6. 50xcca9TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305
  7. 60xcca8TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305
  8. 70xc02cTLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
  9. 80xc030TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
  10. 90xc00aTLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA
  11. 100xc009TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA
  12. 110xc013TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
  13. 120xc014TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
  14. 130x0033TLS_DHE_RSA_WITH_AES_128_CBC_SHA
  15. 140x0039TLS_DHE_RSA_WITH_AES_256_CBC_SHA
  16. 150x009cTLS_RSA_WITH_AES_128_GCM_SHA256
  17. 160x009dTLS_RSA_WITH_AES_256_GCM_SHA384
  18. 170x002fTLS_RSA_WITH_AES_128_CBC_SHA
  19. 180x0035TLS_RSA_WITH_AES_256_CBC_SHA
extensions(17)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. 60x0012signed_certificate_timestamp
  8. 70x0017extended_master_secret
  9. 80x001bcompress_certificate
  10. 90x001crecord_size_limit
  11. 100x0022unknown (0x0022)
  12. 110x0023session_ticket
  13. 120x002bsupported_versions
  14. 130x002dpsk_key_exchange_modes
  15. 140x0033key_share
  16. 150xfe0dencrypted_client_hello
  17. 160xff01renegotiation_info

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

curves / groups(7)
  1. 00x11ecX25519MLKEM768 PQ
  2. 10x001dx25519
  3. 20x0017secp256r1 (P-256)
  4. 30x0018secp384r1 (P-384)
  5. 40x0019secp521r1 (P-521)
  6. 50x0100ffdhe2048
  7. 60x0101ffdhe3072
signature algorithms(11)
  1. 00x0403ecdsa_secp256r1_sha256
  2. 10x0503ecdsa_secp384r1_sha384
  3. 20x0603ecdsa_secp521r1_sha512
  4. 30x0804rsa_pss_rsae_sha256
  5. 40x0805rsa_pss_rsae_sha384
  6. 50x0806rsa_pss_rsae_sha512
  7. 60x0401rsa_pkcs1_sha256
  8. 70x0501rsa_pkcs1_sha384
  9. 80x0601rsa_pkcs1_sha512
  10. 90x0203ecdsa_sha1
  11. 100x0201rsa_pkcs1_sha1

JA3 variants

15 distinct JA3 hashes collapse into this one JA4.

#JA3JA3_rawobsshare
0771,4865-4867-4866-491…-256-257,0526%
1771,4865-4867-4866-491…-256-257,015.3%
2771,4865-4867-4866-491…-256-257,015.3%
3771,4865-4867-4866-491…-256-257,015.3%
4771,4865-4867-4866-491…-256-257,015.3%
5771,4865-4867-4866-491…-256-257,015.3%
6771,4865-4867-4866-491…-256-257,015.3%
7771,4865-4867-4866-491…-256-257,015.3%
8771,4865-4867-4866-491…-256-257,015.3%
9771,4865-4867-4866-491…-256-257,015.3%
10771,4865-4867-4866-491…-256-257,015.3%
11771,4865-4867-4866-491…-256-257,015.3%
12771,4865-4867-4866-491…-256-257,015.3%
13771,4865-4867-4866-491…-256-257,015.3%
14771,4865-4867-4866-491…-256-257,015.3%

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 8 of 8. Share is the fraction of this fingerprint’s observations reaching each name.