known client
Google Chrome / Chromium
Chromium cipher-suite signature — Chrome, Edge, Brave, Opera; any extension permutation or version
Google Chrome / Chromium: a browser-shaped hello, but without the post-quantum key share a current Chrome or Firefox would send.
- JA4
- JA4_r
- JA3
- several builds share this JA4 under different JA3s — no single value is canonical.
- JA3_raw
- —
Read
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
ClientHello anatomy
The underscore groups of JA4_r are the raw cipher suites · extensions · signature algorithms behind the hash.
The post-quantum key share is a structural fact about the hello, not a verdict — GREASE values are flagged the same neutral way.
- 00x1301TLS_AES_128_GCM_SHA256
- 10x1302TLS_AES_256_GCM_SHA384
- 20x1303TLS_CHACHA20_POLY1305_SHA256
- 30xc02bTLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
- 40xc02fTLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
- 50xc02cTLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
- 60xc030TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
- 70xcca9TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305
- 80xcca8TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305
- 90xc013TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
- 100xc014TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
- 110x009cTLS_RSA_WITH_AES_128_GCM_SHA256
- 120x009dTLS_RSA_WITH_AES_256_GCM_SHA384
- 130x002fTLS_RSA_WITH_AES_128_CBC_SHA
- 140x0035TLS_RSA_WITH_AES_256_CBC_SHA
- 00x0000server_name (SNI)
- 10x0005status_request (OCSP)
- 20x000asupported_groups
- 30x000bec_point_formats
- 40x000dsignature_algorithms
- 50x0010application_layer_protocol_negotiation (ALPN)
- 60x0015padding
- 70x0017extended_master_secret
- 80x0023session_ticket
- 90x0029unknown (0x0029)
- 100x002bsupported_versions
- 110x002dpsk_key_exchange_modes
- 120x0033key_share
- 130xff01renegotiation_info
Stored sorted — under one JA4 the wire order varies by construction, so no single order is “the” order.
- 00x001dx25519
- 10x0017secp256r1 (P-256)
- 20x0018secp384r1 (P-384)
- 00x0403ecdsa_secp256r1_sha256
- 10x0804rsa_pss_rsae_sha256
- 20x0401rsa_pkcs1_sha256
- 30x0503ecdsa_secp384r1_sha384
- 40x0805rsa_pss_rsae_sha384
- 50x0501rsa_pkcs1_sha384
- 60x0806rsa_pss_rsae_sha512
- 70x0601rsa_pkcs1_sha512
- 80x0201rsa_pkcs1_sha1
JA3 variants
2 distinct JA3 hashes collapse into this one JA4.
| # | JA3 | JA3_raw | obs | share |
|---|---|---|---|---|
| 0 | 771,4865-4866-4867-491…29-23-24,0 | 16 | 70% | |
| 1 | 771,4865-4866-4867-491…29-23-24,0 | 7 | 30% |
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
- 26%
- 17%
- 13%
- 8.7%
- 8.7%
- 8.7%
- 4.3%
- 4.3%
- 4.3%
- 4.3%
Top 10 of 10. Share is the fraction of this fingerprint’s observations reaching each name.