TCP SYN (JA4T)

65535_2-4-8-1-3_1240_8

first seen 2026-08-19 12:12 · last seen 2026-09-17 09:30 · JSON

Last 7 days (23 observations)

Distinct clients per day (last 30 days, peak 30/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
MSS1240
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
t13d1515h1_8daaf6152771_0a20fe35d3a568
t13d1515h1_8daaf6152771_de4a06bb82e352
t13d1516h1_8daaf6152771_1a63afa7c4787
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
ge11nn13enus_9db22d02e17a_000000000000_00000000000078
ge11nn14enus_4a2973d235de_000000000000_00000000000049
ge20nr13enus_e2ac93ffb364_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.1

TCP SYN (p0f)

fingerprintco-occurrences
4:55+9:0:1240:65535,8:mss,sok,ts,nop,ws:df,id+:036
4:54+10:0:1240:65535,8:mss,sok,ts,nop,ws:df,id+:021
4:53+11:0:1240:65535,8:mss,sok,ts,nop,ws:df,id+:013
4:51+13:0:1240:65535,8:mss,sok,ts,nop,ws:df,id+:012
4:49+15:0:1240:65535,8:mss,sok,ts,nop,ws:df,id+:09
4:52+12:0:1240:65535,8:mss,sok,ts,nop,ws:df,id+:08
4:50+14:0:1240:65535,8:mss,sok,ts,nop,ws:df,id+:08
4:46+18:0:1240:65535,8:mss,sok,ts,nop,ws:df,id+:07
4:47+17:0:1240:65535,8:mss,sok,ts,nop,ws:df,id+:05
4:56+8:0:1240:65535,8:mss,sok,ts,nop,ws:df,id+:04

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.3617
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.3615
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.3614
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.3613
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.3611
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.3610
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.3610
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.367
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.75 Safari/537.367
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.366

Country

fingerprintco-occurrences
US · United States97
CA · Canada8
GB · United Kingdom6
AU · Australia3
NL · Netherlands2
AR · Argentina2
DE · Germany1
BR · Brazil1
BE · Belgium1
MX · Mexico1

Network (ASN)

fingerprintco-occurrences
AS62651 · Strong Technology, LLC.51
AS62240 · Clouvider24
AS46844 · Sharktech9
AS22781 · Strong Technology, LLC.8
AS140952 · Strong Technology, LLC5
AS9009 · M247 Europe SRL4
AS36352 · HostPapa4
AS25369 · Hydra Communications Ltd3
AS54203 · Strong Technology, LLC.3
AS212238 · Datacamp Limited2