TCP SYN (JA4T)

65535_2-4-8-1-3_1420_6

first seen 2026-07-20 00:45 · last seen 2026-09-15 06:49 · JSON

Last 7 days (30 observations)

Distinct clients per day (last 30 days, peak 62/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
MSS1420
Window scale6

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_58ed7828516f314
t13d1515h1_8daaf6152771_de4a06bb82e3191
t13d1515h1_8daaf6152771_0a20fe35d3a5175
t13d1516h1_8daaf6152771_1a63afa7c47820
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.13
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.7
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.2
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.1
t13d4312h1_c7886603b240_b26ce05bbdd61

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.315
ge11nn13enus_9db22d02e17a_000000000000_000000000000273
ge11nn14enus_4a2973d235de_000000000000_000000000000113
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.13
ge20nr13zhcn_e2ac93ffb364_000000000000_0000000000006
ge20nn15enus_28e542058e45_000000000000_0000000000001
ge20nn11enus_dbdd560af68b_000000000000_0000000000001
ge20nr13enus_e2ac93ffb364_000000000000_0000000000001
ge11nr06en00_c11ebffaa84b_000000000000_0000000000001

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, +43 more.The fingerprint page shows the full measured match list. More on the catalog.21
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.1

TCP SYN (p0f)

fingerprintco-occurrences
4:45+19:0:1420:65535,6:mss,sok,ts,nop,ws:df,id+:0132
4:47+17:0:1420:65535,6:mss,sok,ts,nop,ws:df,id+:084
4:46+18:0:1420:65535,6:mss,sok,ts,nop,ws:df,id+:075
4:48+16:0:1420:65535,6:mss,sok,ts,nop,ws:df,id+:053
4:44+20:0:1420:65535,6:mss,sok,ts,nop,ws:df,id+:052
4:49+15:0:1420:65535,6:mss,sok,ts,nop,ws:df,id+:045
4:52+12:0:1420:65535,6:mss,sok,ts,nop,ws:df,id+:039
4:50+14:0:1420:65535,6:mss,sok,ts,nop,ws:df,id+:036
4:43+21:0:1420:65535,6:mss,sok,ts,nop,ws:df,id+:035
4:42+22:0:1420:65535,6:mss,sok,ts,nop,ws:df,id+:034

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.3633
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.75 Safari/537.3631
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.3630
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.3630
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.3630
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.3630
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.3630
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.3627
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.3626
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.3625

Country

fingerprintco-occurrences
BR · Brazil293
SN · Senegal54
IQ · Iraq46
KZ · Kazakhstan37
TN · Tunisia35
MX · Mexico23
IE · Ireland15
PE · Peru15
CL · Chile15
DE · Germany13

Network (ASN)

fingerprintco-occurrences
AS8346 · SONATEL-AS Autonomous System54
AS21299 · Kar-Tel LLC37
AS37492 · Orange Tunisie35
AS28343 · UNIFIQUE TELECOMUNICACOES S/A23
AS6830 · Liberty Global Europe Holding B.V.15
AS270068 · DESARROLLO DE INFRAESTRUCTURA DE TELECOMUNICACIONES PERU S.A.C. (INFRATEL)14
AS205800 · Steps Telecom For Internet Ltd.13
AS51020 · Al-Jazeera Al-Arabiya Company for Communication and Internet LTD13
AS203214 · Hulum Almustakbal Company for Communication Engineering and Services Ltd11
AS24835 · Vodafone Data11