TCP SYN (JA4T)

64800_2-4-8-1-3_1420_7

first seen 2026-08-19 05:29 · last seen 2026-10-16 22:20 · JSON

Distinct clients per day (last 30 days, peak 1/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 window64800
Option kinds2-4-8-1-3
MSS1420
Window scale7

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
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.2
t13d3013h1_1d37bd780c83_8537cf56674e1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr13enus_e2ac93ffb364_000000000000_0000000000002
he11nn050000_b223a0ebb0b5_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, +57 more.The fingerprint page shows the full measured match list. More on the catalog.2

TCP SYN (p0f)

fingerprintco-occurrences
6:49+15:0:1420:mss*45,7:mss,sok,ts,nop,ws:flow:01
6:46+18:0:1420:mss*45,7:mss,sok,ts,nop,ws:flow:01
6:45+19:0:1420:mss*45,7:mss,sok,ts,nop,ws:flow:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.362
python-requests/2.32.31

Country

fingerprintco-occurrences
HU · Hungary2
BR · Brazil1

Network (ASN)

fingerprintco-occurrences
AS20845 · 2Connect Telecommunications Infrastructure & Network Services Ltd.1
AS21334 · 2Connect Telecommunications Infrastructure & Network Services Ltd.1
AS265369 · C-ComTelecom Servios Ltda-ME1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.22.1, python-httpx 0.28.1, python-requests 2.34.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog.1