TCP SYN (JA4T)

64240_2-1-3-1-1-4_1448_8

first seen 2026-08-20 01:23 · last seen 2026-08-31 11:08 · JSON

Decomposed attributes

TCP window64240
Option kinds2-1-3-1-1-4
MSS1448
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
t13d2913h1_723694b0fccc_5671b5df50294
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.3

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr12zhcn_54b4638ab28b_000000000000_0000000000003
ge11nr11itit_835281d8e5d9_000000000000_0000000000001
ge11nn11ruru_835281d8e5d9_000000000000_0000000000001
ge11nr11ruru_835281d8e5d9_000000000000_0000000000001
ge11nn11itit_835281d8e5d9_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 152.0.7977.83, +85 more.The fingerprint page shows the full measured match list. More on the catalog.2
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.1

TCP SYN (p0f)

fingerprintco-occurrences
4:111+17:0:1448:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+:03
4:112+16:0:1448:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+:02
4:54+10:0:1448:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+:02

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.363
Mozilla/5.0 (iPad; CPU OS 18_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.0 Mobile/15E148 Safari/604.12
Mozilla/5.0 (iPad; CPU OS 18_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) FxiOS/153.0 Mobile/15E148 Safari/604.12

Country

fingerprintco-occurrences
CN · China3
RU · Russia2
IT · Italy2

Network (ASN)

fingerprintco-occurrences
AS4837 · CHINA UNICOM China169 Backbone3
AS12389 · PJSC Rostelecom2
AS24608 · WIND TRE S.P.A.2

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_653d80c3fe9d1