TCP SYN (JA4T)

65535_2-1-3-4-8_1440_8

first seen 2026-07-28 23:15 · last seen 2026-10-23 22:17 · JSON

Distinct clients per day (last 30 days, peak 3/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 kinds2-1-3-4-8
MSS1440
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
t13d1513h2_8daaf6152771_eca864cca44a11
t13d1515h1_8daaf6152771_0a20fe35d3a54
t13d1713h1_5b57614c22b0_eca864cca44a2
t13d2913h1_723694b0fccc_5671b5df50292
t13d1114h2_5e2a75874763_89e9e4bb34191
t13d2013h1_2b729b4bf6f3_e24568c0d4401
t12d0812h2_6aee0a5c6037_70b99c08f4661

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn020000_fb4f949fd323_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: powershell 7.6.6, powershell 7.6.9, powershell 7.6.8.The fingerprint page shows the full measured match list. More on the catalog.6
ge20nn04enus_39a3ba4480e8_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: urlsession 6.1.2.The fingerprint page shows the full measured match list. More on the catalog.3
ge11nn13enus_9db22d02e17a_000000000000_0000000000003
ge20nn030000_ff50983941c1_000000000000_0000000000002
ge11nn040000_e1d2031bdfea_000000000000_0000000000001
ge11nn040000_4f6f4aad0c1e_000000000000_0000000000001
ge11nn14enus_4a2973d235de_000000000000_0000000000001
ge11nn050000_dc01eb6f2852_000000000000_0000000000001
ge20nn050000_de1433f8c918_000000000000_0000000000001
ge20nn070000_4c5876fa6f79_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
4:16777216|16711681|0|m,p,a,s13

TCP SYN (p0f)

fingerprintco-occurrences
4:117+11:0:1440:65535,8:mss,nop,ws,sok,ts:df,id+:017
4:116+12:0:1440:65535,8:mss,nop,ws,sok,ts:df,id+:02
4:118+10:0:1440:65535,8:mss,nop,ws,sok,ts:df,id+:02
4:55+9:0:1440:65535,8:mss,nop,ws,sok,ts:df,id+:01

User-Agent

fingerprintco-occurrences
okhttp/4.12.011
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.362
Dalvik/2.1.0 (Linux; U; Android 11; redroid11_x86_64 Build/RD2A.211001.002)2
ozonhireapp_android_prod2
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.361
curl/8.14.11
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.361
Mozilla/5.0 (iPhone; CPU iPhone OS 17_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.6 Mobile/15E148 Safari/604.11
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/604.11

Country

fingerprintco-occurrences
RU · Russia22

Network (ASN)

fingerprintco-occurrences
AS12389 · PJSC Rostelecom22

TLS supported groups

fingerprintco-occurrences
0a0a,001d,0017,00182
001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.12.28, rust-reqwest 0.11.27, winhttp 10.0.20348.1, +2 more.The fingerprint page shows the full measured match list. More on the catalog.1
0a0a,11ec,001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 156.0.8078.48, edge 155.0.4283.62, chrome 156.0.8078.47, +11 more.The fingerprint page shows the full measured match list. More on the catalog.1