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unrecognised fingerprint

t13d2713h2_bd9791dd9fd6_ecd0401ec68b

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 h2 · http/1.12026-07-19 → 2026-07-23
JA4
JA4_r
JA3
JA3_raw
This JA3 resolves unambiguously to the JA4 above.

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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 348 connections: a deterministic stack. Libraries and command-line clients look like this.
reach
0.834 roams across 31 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

348
observations
31
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(27)
  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. 90xc013TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
  11. 100xc014TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
  12. 110x009cTLS_RSA_WITH_AES_128_GCM_SHA256
  13. 120x009dTLS_RSA_WITH_AES_256_GCM_SHA384
  14. 130x002fTLS_RSA_WITH_AES_128_CBC_SHA
  15. 140x0035TLS_RSA_WITH_AES_256_CBC_SHA
  16. 150xc02bTLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
  17. 160xc02fTLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
  18. 170xc02cTLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
  19. 180xc030TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
  20. 190xcca9TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305
  21. 200xcca8TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305
  22. 210xc013TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
  23. 220xc014TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
  24. 230x009cTLS_RSA_WITH_AES_128_GCM_SHA256
  25. 240x009dTLS_RSA_WITH_AES_256_GCM_SHA384
  26. 250x002fTLS_RSA_WITH_AES_128_CBC_SHA
  27. 260x0035TLS_RSA_WITH_AES_256_CBC_SHA
extensions(13)sorted
  1. 00x0000server_name (SNI)
  2. 10x000asupported_groups
  3. 20x000bec_point_formats
  4. 30x000dsignature_algorithms
  5. 40x0010application_layer_protocol_negotiation (ALPN)
  6. 50x0016encrypt_then_mac
  7. 60x0017extended_master_secret
  8. 70x001bcompress_certificate
  9. 80x0023session_ticket
  10. 90x002bsupported_versions
  11. 100x002dpsk_key_exchange_modes
  12. 110x0033key_share
  13. 120xff01renegotiation_info

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

curves / groups(4)
  1. 00x11ecX25519MLKEM768 PQ
  2. 10x001dx25519
  3. 20x0017secp256r1 (P-256)
  4. 30x0018secp384r1 (P-384)
signature algorithms(26)
  1. 00x0905unknown (0x0905)
  2. 10x0906unknown (0x0906)
  3. 20x0904unknown (0x0904)
  4. 30x0403ecdsa_secp256r1_sha256
  5. 40x0503ecdsa_secp384r1_sha384
  6. 50x0603ecdsa_secp521r1_sha512
  7. 60x0807ed25519
  8. 70x0808ed448
  9. 80x081aunknown (0x081a)
  10. 90x081bunknown (0x081b)
  11. 100x081cunknown (0x081c)
  12. 110x0809rsa_pss_pss_sha256
  13. 120x080arsa_pss_pss_sha384
  14. 130x080brsa_pss_pss_sha512
  15. 140x0804rsa_pss_rsae_sha256
  16. 150x0805rsa_pss_rsae_sha384
  17. 160x0806rsa_pss_rsae_sha512
  18. 170x0401rsa_pkcs1_sha256
  19. 180x0501rsa_pkcs1_sha384
  20. 190x0601rsa_pkcs1_sha512
  21. 200x0303rsa_pkcs1_sha512 (legacy)
  22. 210x0301rsa_pkcs1_sha256 (legacy)
  23. 220x0302rsa_pkcs1_sha384 (legacy)
  24. 230x0402rsa_pkcs1_sha384
  25. 240x0502ecdsa_secp384r1_sha384
  26. 250x0602ecdsa_secp521r1_sha512

Reach — domains contacted

Top 15 of 31. Share is the fraction of this fingerprint’s observations reaching each name.