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known client

Node.js fetch / undici

Node 22 — bundled OpenSSL 3 (newer)

Named client

Matches Node.js fetch / undici in the ground-truth catalogue.

TLS 1.3ALPN 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
—

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Read

catalog identity
Matches Node.js fetch / undici in the ground-truth catalogue.
self-randomisation
multi-build · 3 JA3 — 3 JA3s over 6081 connections, but most repeat: a handful of stable builds sharing one JA4 rather than per-connection randomisation.
reach
0.954 roams across 3,970 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

6,081
observations
3,970
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)
http/1.1
EC point formats
0x0000, 0x0001, 0x0002
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(52)
  1. 00x1302TLS_AES_256_GCM_SHA384
  2. 10x1303TLS_CHACHA20_POLY1305_SHA256
  3. 20x1301TLS_AES_128_GCM_SHA256
  4. 30xc02fTLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
  5. 40xc02bTLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
  6. 50xc030TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
  7. 60xc02cTLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
  8. 70x009eTLS_DHE_RSA_WITH_AES_128_GCM_SHA256
  9. 80xc027TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
  10. 90x0067TLS_DHE_RSA_WITH_AES_128_CBC_SHA256
  11. 100xc028TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
  12. 110x006bTLS_DHE_RSA_WITH_AES_256_CBC_SHA256
  13. 120x00a3TLS_DHE_DSS_WITH_AES_256_GCM_SHA384
  14. 130x009fTLS_DHE_RSA_WITH_AES_256_GCM_SHA384
  15. 140xcca9TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305
  16. 150xcca8TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305
  17. 160xccaaTLS_DHE_RSA_WITH_CHACHA20_POLY1305
  18. 170xc0adTLS_ECDHE_ECDSA_WITH_AES_256_CCM
  19. 180xc09fTLS_DHE_RSA_WITH_AES_256_CCM
  20. 190xc05dTLS_ECDHE_ECDSA_WITH_ARIA_256_GCM_SHA384
  21. 200xc061TLS_ECDHE_RSA_WITH_ARIA_256_GCM_SHA384
  22. 210xc057TLS_DHE_RSA_WITH_ARIA_256_GCM_SHA384
  23. 220xc053TLS_RSA_WITH_ARIA_256_GCM_SHA384
  24. 230x00a2TLS_DHE_DSS_WITH_AES_128_GCM_SHA256
  25. 240xc0acTLS_ECDHE_ECDSA_WITH_AES_128_CCM
  26. 250xc09eTLS_DHE_RSA_WITH_AES_128_CCM
  27. 260xc05cTLS_ECDHE_ECDSA_WITH_ARIA_128_GCM_SHA256
  28. 270xc060TLS_ECDHE_RSA_WITH_ARIA_128_GCM_SHA256
  29. 280xc056TLS_DHE_RSA_WITH_ARIA_128_GCM_SHA256
  30. 290xc052TLS_RSA_WITH_ARIA_128_GCM_SHA256
  31. 300xc024TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384
  32. 310x006aTLS_DHE_DSS_WITH_AES_256_CBC_SHA256
  33. 320xc023TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256
  34. 330x0040TLS_DHE_DSS_WITH_AES_128_CBC_SHA256
  35. 340xc00aTLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA
  36. 350xc014TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
  37. 360x0039TLS_DHE_RSA_WITH_AES_256_CBC_SHA
  38. 370x0038TLS_DHE_DSS_WITH_AES_256_CBC_SHA
  39. 380xc009TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA
  40. 390xc013TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
  41. 400x0033TLS_DHE_RSA_WITH_AES_128_CBC_SHA
  42. 410x0032TLS_DHE_DSS_WITH_AES_128_CBC_SHA
  43. 420x009dTLS_RSA_WITH_AES_256_GCM_SHA384
  44. 430xc09dTLS_RSA_WITH_AES_256_CCM
  45. 440xc051TLS_RSA_WITH_ARIA_256_CBC_SHA384
  46. 450x009cTLS_RSA_WITH_AES_128_GCM_SHA256
  47. 460xc09cTLS_RSA_WITH_AES_128_CCM
  48. 470xc050TLS_RSA_WITH_ARIA_128_CBC_SHA256
  49. 480x003dTLS_RSA_WITH_AES_256_CBC_SHA256
  50. 490x003cTLS_RSA_WITH_AES_128_CBC_SHA256
  51. 500x0035TLS_RSA_WITH_AES_256_CBC_SHA
  52. 510x002fTLS_RSA_WITH_AES_128_CBC_SHA
extensions(12)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. 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(8)
  1. 00x11ecX25519MLKEM768 PQ
  2. 10x001dx25519
  3. 20x0017secp256r1 (P-256)
  4. 30x001ex448
  5. 40x0018secp384r1 (P-384)
  6. 50x0019secp521r1 (P-521)
  7. 60x0100ffdhe2048
  8. 70x0101ffdhe3072
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

JA3 variants

3 distinct JA3 hashes collapse into this one JA4.

#JA3JA3_rawobsshare
0771,4866-4867-4865-491…-257,0-1-26,055100%
1771,4866-4867-4865-491…-260,0-1-2200.3%
2771,4866-4867-4865-491…-256-257,06<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 3,970. Share is the fraction of this fingerprint’s observations reaching each name.