TCP SYN (JA4T)

65535_2-1-3-1-1-8-4-0-0_1200_6

first seen 2026-08-17 06:56 · last seen 2026-08-17 07:03 · 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 kinds2-1-3-1-1-8-4-0-0
MSS1200
Window scale6

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
t12d380500_10ed599f3404_67a080e8974e3
t12d3806h1_10ed599f3404_67a080e8974e1
t13d1515h1_8daaf6152771_e4c2b8c727f21

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn050000_ea6f06182064_000000000000_0000000000002
ge20nn030000_6dac75bd47eb_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1.The fingerprint page shows the full measured match list. More on the catalog.1
ge11nn18zhcn_c3357ce381a5_000000000000_0000000000001
ge11nn040000_5b1e8b5f4d2d_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:4096;2:0;4:65535;5:16384;3:100;6:65536|16777216|0|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (p0f)

fingerprintco-occurrences
4:34+30:0:1200:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,ecn:05

User-Agent

fingerprintco-occurrences
Mozilla/5.02
python-httpx/0.28.11
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.361
curl/8.01

Country

fingerprintco-occurrences
US · United States5

Network (ASN)

fingerprintco-occurrences
AS174 · Cogent Communications, LLC5