TCP SYN (JA4T)

65535_2-1-3-1-1-4-1-1-8_1380_8

first seen 2026-08-19 12:12 · last seen 2026-08-19 12:12 · 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 window65535
Option kinds2-1-3-1-1-4-1-1-8
MSS1380
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
t13d1517h2_8daaf6152771_b1ff8ab2d16f1

HTTP request (JA4H)

fingerprintco-occurrences
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
4:42+22:0:1380:65535,8:mss,nop,ws,nop,nop,sok,nop,nop,ts::01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 Edg/145.0.0.01

Country

fingerprintco-occurrences
TZ · Tanzania1

Network (ASN)

fingerprintco-occurrences
AS37133 · Airtel Tanzania1