TCP SYN (JA4T)

64800_2-1-3-1-1-4_1420_8

first seen 2026-08-09 04:18 · last seen 2026-09-01 19:29 · JSON

Distinct clients per day (last 30 days, peak 1/day)

Distinct clients are counted by IP-hash per complete UTC day — unlike observation counts this is insensitive to one chatty client, but NAT merges clients and address rotation splits them.

Decomposed attributes

TCP window64800
Option kinds2-1-3-1-1-4
MSS1420
Window scale8

Co-observed signals

Signals from other families seen in the same observation. A fingerprint spread thinly across many lower-layer signatures is a classic inconsistency signal.

TLS ClientHello (JA4)

fingerprintco-occurrences
t13d1517h2_8daaf6152771_cb7bf5808d99 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 152.0.7977.83, chrome 152.0.7977.64, chrome 152.0.7977.65, +5 more.The fingerprint page shows the full measured match list. More on the catalog.25
t13d1516h2_8daaf6152771_d8a2da3f94cd Match?Exact match in Thumbprint's published controlled catalog captures: chromium 149.0.7827.102, chrome 149.0.7827.102, chrome 149.0.7827.156, +25 more.The fingerprint page shows the full measured match list. More on the catalog.13
t13d1516h2_8daaf6152771_806a8c22fdea Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 151.0.7922.137, chromium 151.0.7922.34, +24 more.The fingerprint page shows the full measured match list. More on the catalog.5
t13d1516h2_8daaf6152771_02713d6af862 Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 134.0.6998.35, chromium 133.0.6943.16.The fingerprint page shows the full measured match list. More on the catalog.4
t13d1515h2_8daaf6152771_e4c2b8c727f23
t12d210700_76e208dd3e22_2dae41c691ec1
t13d0911h2_f91f431d341e_78e6aca7449b1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn13ptbr_0c2c1d640f3e_000000000000_00000000000028
ge20nn13enus_0c2c1d640f3e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 151.0.7922.137, chrome 151.0.7922.170, chrome 151.0.7922.108, +23 more.The fingerprint page shows the full measured match list. More on the catalog.12
ge20nr12engb_54b4638ab28b_000000000000_0000000000003
ge20nr12en00_54b4638ab28b_000000000000_0000000000003
ge20nn020000_b89ce445e0b3_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13, go-net/http 1.27.0, go-net/http 1.26.6, +10 more.The fingerprint page shows the full measured match list. More on the catalog.2
ge20nr15engb_10b3ad36ea15_000000000000_0000000000001
ge20nn13en00_9519c2577190_000000000000_0000000000001
ge11nn030000_b0d6a43aa599_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: powershell 5.1.26100.33296, powershell 5.1.26100.33158, powershell 5.1.26100.32995.The fingerprint page shows the full measured match list. More on the catalog.1
ge20nn13ptbr_b86d3ec64b7b_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chromium 149.0.7827.102, chrome 149.0.7827.102, +59 more.The fingerprint page shows the full measured match list. More on the catalog.9
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 151.0.7922.34, chrome 151.0.7922.137, +43 more.The fingerprint page shows the full measured match list. More on the catalog.6
1:65536;2:0;4:6291456;6:262144|15663105|0|m,a,s,p6
1:65536;2:0;4:6291456;6:262144|15663105|3:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 151.0.7922.34, chromium 147.0.7727.15, chromium 145.0.7632.6, +21 more.The fingerprint page shows the full measured match list. More on the catalog.4
1:65536;2:0;4:6291456;6:262144|15663105|3:1:0:256|m,a,s,p4
1:65536;2:0;4:6291456;6:262144|15663105|5:1:0:256|m,a,s,p2
1:65536;2:0;4:6291456;6:262144|15663105|7:1:0:256|m,a,s,p2
1:65536;2:0;4:6291456;6:262144|15663105|9:1:0:256|m,a,s,p2
1:65536;2:0;4:6291456;6:262144|15663105|11:1:0:256|m,a,s,p2
1:65536;2:0;4:6291456;6:262144|15663105|13:1:0:256|m,a,s,p2

TCP SYN (p0f)

fingerprintco-occurrences
6:48+16:0:1420:mss*45,8:mss,nop,ws,nop,nop,sok:flow:029
6:47+17:0:1420:mss*45,8:mss,nop,ws,nop,nop,sok:flow:015
6:52+12:0:1420:mss*45,8:mss,nop,ws,nop,nop,sok:flow:04
6:241+14:0:1420:mss*45,8:mss,nop,ws,nop,nop,sok:flow:04

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/152.0.0.0 Safari/537.3628
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Safari/537.3612
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36 Edg/131.0.0.04
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.363
urllib3.future/2.24.9052
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.7063.95 Safari/537.361
Mozilla/5.0 (Windows NT; Windows NT 10.0; pt-BR) WindowsPowerShell/5.1.19041.64561

Country

fingerprintco-occurrences
BR · Brazil44
AU · Australia4
CN · China4

Network (ASN)

fingerprintco-occurrences
AS7738 · V tal44
AS9808 · China Mobile Communications Group Co., Ltd.4
AS134090 · Leaptel4

Cross-transport links

TLS ClientHello fingerprints observed from the same client via the beacon's correlation id on the other transport (e.g. this stack over TCP ↔ that stack over QUIC).

fingerprintlinked observations
q13d0311h3_55b375c5d22e_653d80c3fe9d4
q13d0311h3_55b375c5d22e_5a1f323ef56d3