TCP SYN (JA4T)

42340_2-4-8-1-3_1460_9

first seen 2026-06-30 18:55 · last seen 2026-09-14 01:09 · JSON

Last 7 days (12 observations)

Distinct clients per day (last 30 days, peak 13/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 window42340
Option kinds2-4-8-1-3
MSS1460
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
t13d151100_8daaf6152771_ab7e3b40a677393
t13d3515h1_8f004308c246_5c2c66f702b0225
t13d191000_9dc949149365_e7c285222651136
t13d1312h1_f57a46bbacb6_ab7e3b40a67785
t13d311200_e8f1e7e78f70_d339722ba4af65
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.37
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.23
t13d3112h1_e8f1e7e78f70_b26ce05bbdd6 Match?Exact match in Thumbprint's published controlled catalog captures: php-guzzle 8.1.0, php-guzzle 8.0.2, php-guzzle 7.14.2, +6 more.The fingerprint page shows the full measured match list. More on the catalog.11
t13d351400_8f004308c246_5c2c66f702b07
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.7

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn050000_a1c329e38462_000000000000_000000000000174
ge11nn05zh00_4ee89fec50ea_000000000000_00000000000080
ge11nn06enus_3ce581af28ff_000000000000_00000000000065
po11nn080000_86f5668e3d93_000000000000_00000000000058
ge11nn05zh00_ddc401472a00_000000000000_00000000000029
ge11nr39enus_1c19b8b5959c_000000000000_00000000000027
ge11nr38enus_c9f28418db6b_000000000000_00000000000024
ge11nr39enus_8275968c859c_000000000000_00000000000023
ge11nr37enus_49f6cf8b676e_000000000000_00000000000020
ge11nr05enus_900748f1e0f3_000000000000_00000000000019

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.14
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.9
1:65536;2:0;4:6291456;6:262144;4:1048576|15663105|1:0:0:256|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.5
1:65536;2:0;4:6291456;6:262144|15663105|5:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 133.0.6943.16, chrome 150.0.7871.128, chromium 148.0.7778.96, +2 more.The fingerprint page shows the full measured match list. More on the catalog.5
3:100;4:65536;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, curl 8.18.0, curl 8.21.0, +7 more.The fingerprint page shows the full measured match list. More on the catalog.1
1:65536;3:1000;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p1
1:65536;2:0;4:6291456;6:262144|15663105|7:1:0:256|m,a,s,p1

TCP SYN (p0f)

fingerprintco-occurrences
4:54+10:0:1460:mss*29,9:mss,sok,ts,nop,ws:df,id+:0337
4:55+9:0:1460:mss*29,9:mss,sok,ts,nop,ws:df,id+:0202
4:56+8:0:1460:mss*29,9:mss,sok,ts,nop,ws:df,id+:0187
4:49+15:0:1460:mss*29,9:mss,sok,ts,nop,ws:df,id+:082
4:50+14:0:1460:mss*29,9:mss,sok,ts,nop,ws:df,id+:052
4:57+7:0:1460:mss*29,9:mss,sok,ts,nop,ws:df,id+:050
4:53+11:0:1460:mss*29,9:mss,sok,ts,nop,ws:df,id+:022
4:47+17:0:1460:mss*29,9:mss,sok,ts,nop,ws:df,id+:020
4:46+18:0:1460:mss*29,9:mss,sok,ts,nop,ws:df,id+:018
4:52+12:0:1460:mss*29,9:mss,sok,ts,nop,ws:df,id+:018

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; Infrawatch/1.0; +https://infrawat.ch/)232
StartmeBot/1.0 (+https://start.me/bot)65
Mozilla/5.0 (Linux; Android 11; vivo 1906; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/87.0.4280.141 Mobile Safari/537.36 VivoBrowser/8.9.0.063
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.3654
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.121 Safari/537.3632
curl/7.4.029
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.3629
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/148.0.0.0 Safari/537.3624
Mozilla/5.0 (Linux; U; Android 14; en-US; Redmi Note 13 Pro Build/UP1A.231005.007) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 UCBrowser/13.4.0.1306 Mobile Safari/537.3622
Mozilla/5.0 (Linux; Android 14; SM-S918B Build/UP1A.231005.007) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/25.0 Chrome/121.0.0.0 Mobile Safari/537.3620

Country

fingerprintco-occurrences
US · United States536
GB · United Kingdom183
CN · China136
SE · Sweden58
NL · Netherlands57
DE · Germany19
HK · Hong Kong SAR China8
LV · Latvia6
CH · Switzerland5
FI · Finland3

Network (ASN)

fingerprintco-occurrences
AS150303 · SoloRDP282
AS25369 · Hydra Communications Ltd232
AS142430 · DIGI VPS151
AS4134 · CHINANET BACKBONE136
AS14618 · Amazon.com, Inc.65
AS203861 · Miteflux Technologies Ltd58
AS64267 · Sprious LLC16
AS212238 · Datacamp Limited13
AS14061 · DigitalOcean, LLC11
AS211443 · SINO WORLDWIDE TRADING LIMITED10

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
q13d0312h3_55b375c5d22e_178839b6cec12