TCP SYN (JA4T)

42300_2-4-8-1-3-254_1410_8

first seen 2026-07-01 09:33 · last seen 2026-09-15 16:22 · JSON

Last 7 days (15 observations)

Distinct clients per day (last 30 days, peak 11/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 window42300
Option kinds2-4-8-1-3-254
MSS1410
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
t13d3112h1_e8f1e7e78f70_8d633dac712425
t13d3112h2_e8f1e7e78f70_8d633dac71241

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn060000_3e7ded867bc2_000000000000_00000000000025
ge20nn040000_b221e026a664_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
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

TCP SYN (p0f)

fingerprintco-occurrences
4:45+19:0:1410:mss*30,8:mss,sok,ts,nop,ws,?254::010
4:41+23:0:1410:mss*30,8:mss,sok,ts,nop,ws,?254::05
4:44+20:0:1410:mss*30,8:mss,sok,ts,nop,ws,?254::03
4:40+24:0:1410:mss*30,8:mss,sok,ts,nop,ws,?254::03
4:37+27:0:1410:mss*30,8:mss,sok,ts,nop,ws,?254::03
4:39+25:0:1410:mss*30,8:mss,sok,ts,nop,ws,?254::01
4:43+21:0:1410:mss*30,8:mss,sok,ts,nop,ws,?254::01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots)26

Country

fingerprintco-occurrences
RU · Russia26

Network (ASN)

fingerprintco-occurrences
AS13238 · YANDEX LLC26