TCP SYN (JA4T)

65535_2-4-8-1-3_1452_9

first seen 2026-07-01 14:37 · last seen 2026-10-31 10:59 · JSON

Last 7 days (12 observations)

Distinct clients per day (last 30 days, peak 8/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 window65535
Option kinds2-4-8-1-3
MSS1452
Window scale9

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
t13d4412h1_fd39b124ee10_58ed7828516f39
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, +28 more.The fingerprint page shows the full measured match list. More on the catalog.26
t13d1515h1_8daaf6152771_0a20fe35d3a518
t13d131100_f57a46bbacb6_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.5, go-net/http 1.26.4.The fingerprint page shows the full measured match list. More on the catalog.12
t13d1515h1_8daaf6152771_de4a06bb82e311
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.10
t13d4312h1_c7886603b240_b26ce05bbdd68
t13d1516h1_8daaf6152771_1a63afa7c4784
t13d171000_5b57614c22b0_78e6aca7449b2
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.1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn050000_b223a0ebb0b5_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.34.2, python-requests 2.33.1, python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog.47
ge11nn13enus_9db22d02e17a_000000000000_00000000000024
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, +39 more.The fingerprint page shows the full measured match list. More on the catalog.23
ge11nn14enus_4a2973d235de_000000000000_0000000000009
ge20nr12engb_54b4638ab28b_000000000000_0000000000003
ge20nr12enus_54b4638ab28b_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 152.0.7977.83, chrome 151.0.7922.137, +61 more.The fingerprint page shows the full measured match list. More on the catalog.3
ge20nr13engb_b3e540f310f0_000000000000_0000000000003
ge11nr19frfr_4e9b73ab7510_000000000000_0000000000003
ge11nn050000_b5e847c80b4c_000000000000_0000000000002
ge20nr13engb_5907f7c6644a_000000000000_0000000000002

HTTP/2 frames (Akamai)

fingerprintco-occurrences
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, +60 more.The fingerprint page shows the full measured match list. More on the catalog.27
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 152.0.7977.83, +85 more.The fingerprint page shows the full measured match list. More on the catalog.9
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, +26 more.The fingerprint page shows the full measured match list. More on the catalog.2
1:65536;4:131072;5:16384|12517377|3:0:0:201,5:0:0:101,7:0:0:1,9:0:7:1,11:0:3:1,13:0:0:241,15:0:13:42|m,p,a,s1

TCP SYN (p0f)

fingerprintco-occurrences
4:48+16:0:1452:65535,9:mss,sok,ts,nop,ws:df,id+:020
4:51+13:0:1452:65535,9:mss,sok,ts,nop,ws:df,id+:016
4:47+17:0:1452:65535,9:mss,sok,ts,nop,ws:df,id+:014
4:44+20:0:1452:65535,9:mss,sok,ts,nop,ws:df,id+:014
4:46+18:0:1452:65535,9:mss,sok,ts,nop,ws:df,id+:013
4:50+14:0:1452:65535,9:mss,sok,ts,nop,ws:df,id+:010
4:45+19:0:1452:65535,9:mss,sok,ts,nop,ws:df,id+:08
4:43+21:0:1452:65535,9:mss,sok,ts,nop,ws:df,id+:08
4:49+15:0:1452:65535,9:mss,sok,ts,nop,ws:df,id+:06
4:42+22:0:1452:65535,9:mss,sok,ts,nop,ws:df,id+:06

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.3623
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.367
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Mobile Safari/537.366
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.366
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.365
Mozilla/5.0 (Linux; Android 12; Redmi Note 9S Build/SKQ1.211019.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/149.0.7827.91 Mobile Safari/537.364
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.363
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.363
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.363
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Mobile Safari/537.36 EdgA/151.0.0.03

Country

fingerprintco-occurrences
PK · Pakistan34
CN · China21
ZA · South Africa15
AE · United Arab Emirates14
MY · Malaysia9
BD · Bangladesh5
GB · United Kingdom3
MA · Morocco3
SI · Slovenia3
DE · Germany2

Network (ASN)

fingerprintco-occurrences
AS17557 · Pakistan Telecommunication Company Limited23
AS5384 · Emirates Internet13
AS4788 · TM TECHNOLOGY SERVICES SDN. BHD.9
AS56047 · China Mobile communications corporation8
AS4134 · CHINANET BACKBONE6
AS328471 · HERO TELECOMS (PTY) LTD5
AS5603 · Telekom Slovenije, d.d.3
AS131275 · Logon Broadband Pvt. Limited3
AS4837 · CHINA UNICOM China169 Backbone2
AS36903 · Office National des Postes et Telecommunications ONPT (Maroc Telecom) / IAM2

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 158.0.1, firefox 157.0, firefox 157.0.1, +5 more.The fingerprint page shows the full measured match list. More on the catalog.12
001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, php-guzzle 8.3.1, curl 7.88.1, +10 more.The fingerprint page shows the full measured match list. More on the catalog.6
0a0a,11ec,001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 156.0.8078.48, edge 155.0.4283.62, chrome 156.0.8078.47, +11 more.The fingerprint page shows the full measured match list. More on the catalog.1

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_653d80c3fe9d10
q13d0312h3_55b375c5d22e_178839b6cec11