TCP SYN (JA4T)

65535_2-1-1-4-1-3_1460_9

first seen 2026-07-11 06:57 · last seen 2026-10-30 16:36 · JSON

Last 7 days (6 observations)

Distinct clients per day (last 30 days, peak 2/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 kinds2-1-1-4-1-3
MSS1460
Window scale9

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
t12d290700_fc2078a0b8c0_8c06664c3ac557
t13d1516h2_8daaf6152771_d8a2da3f94cd Match?Exact match in Thumbprint's published controlled catalog captures: chromium 149.0.7827.102, chrome 149.0.7827.102, chrome 149.0.7827.156, +25 more.The fingerprint page shows the full measured match list. More on the catalog.19
t13d131000_f57a46bbacb6_e7c285222651 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.23.12.The fingerprint page shows the full measured match list. More on the catalog.4

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn040000_bfa5a9b89dd6_000000000000_00000000000032
ge11nn06en00_3011d71998e2_000000000000_00000000000024
ge20nn13zhcn_0c2c1d640f3e_000000000000_00000000000019
ge11nn030000_cd680697de12_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: powershell 7.6.6, powershell 7.6.5, powershell 7.6.4, +11 more.The fingerprint page shows the full measured match list. More on the catalog.4
ge10nn030000_dd98166e0881_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, +60 more.The fingerprint page shows the full measured match list. More on the catalog.13
1:65536;2:0;4:6291456;6:262144|15663105|3:1:0:256|m,a,s,p6

TCP SYN (p0f)

fingerprintco-occurrences
4:46+18:0:1460:65535,9:mss,nop,nop,sok,nop,ws::057
4:47+17:0:1460:65535,9:mss,nop,nop,sok,nop,ws:df,id+:09
4:46+18:0:1460:65535,9:mss,nop,nop,sok,nop,ws:df,id+:04
4:48+16:0:1460:65535,9:mss,nop,nop,sok,nop,ws:df,id+:03
4:44+20:0:1460:65535,9:mss,nop,nop,sok,nop,ws:df,id+:03
4:54+10:0:1460:65535,9:mss,nop,nop,sok,nop,ws:df,id+:02
4:49+15:0:1460:65535,9:mss,nop,nop,sok,nop,ws:df,id+:01
4:43+21:0:1460:65535,9:mss,nop,nop,sok,nop,ws:df,id+:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)57
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.3619
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.362
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
FI · Finland53
CN · China19
DE · Germany4
FR · France4

Network (ASN)

fingerprintco-occurrences
AS24940 · Hetzner Online GmbH53
AS4808 · China Unicom Beijing Province Network9
AS211590 · Bucklog SARL4
AS8560 · IONOS SE4
AS4812 · China Telecom (Group)4
AS4134 · CHINANET BACKBONE3
AS4811 · China Telecom (Group)1
AS56044 · China Mobile communications corporation1
AS136195 · Qingdao, Shandong Province, P.R.China.1

TLS supported groups

fingerprintco-occurrences
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.6