TCP SYN (JA4T)

65535_2-1-1-4-1-3_1440_7

first seen 2026-06-30 02:07 · last seen 2026-10-27 06:54 · JSON

Last 7 days (9 observations)

Distinct clients per day (last 30 days, peak 54/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
MSS1440
Window scale7

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
t13d3013h2_1d37bd780c83_8537cf56674e115
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.53
t13d1516h2_8daaf6152771_806a8c22fdea Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 151.0.7922.137, chromium 151.0.7922.34, +28 more.The fingerprint page shows the full measured match list. More on the catalog.10
t13d1517h2_8daaf6152771_cb7bf5808d99 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 152.0.7977.83, chrome 154.0.8037.57, chrome 152.0.7977.64, +24 more.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn030000_bf75ddd0bb29_000000000000_000000000000115
ge20nn13zhcn_0c2c1d640f3e_000000000000_00000000000034
ge20nn13zhcn_30dc68305204_000000000000_00000000000016
ge20nr12zhcn_54b4638ab28b_000000000000_0000000000008
ge20nn13zhcn_9519c2577190_000000000000_0000000000004
ge20nn13vivn_9519c2577190_000000000000_0000000000002

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, +8 more.The fingerprint page shows the full measured match list. More on the catalog.115
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, +57 more.The fingerprint page shows the full measured match list. More on the catalog.40
1:65536;2:0;4:6291456;6:262144|15663105|3:1:0:256|m,a,s,p16
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chromium 149.0.7827.102, chrome 152.0.7977.83, +81 more.The fingerprint page shows the full measured match list. More on the catalog.8

TCP SYN (p0f)

fingerprintco-occurrences
6:48+16:0:1440:65535,7:mss,nop,nop,sok,nop,ws:flow:039
6:49+15:0:1440:65535,7:mss,nop,nop,sok,nop,ws:flow:029
6:46+18:0:1440:65535,7:mss,nop,nop,sok,nop,ws:flow:019
6:50+14:0:1440:65535,7:mss,nop,nop,sok,nop,ws:flow:017
6:51+13:0:1440:65535,7:mss,nop,nop,sok,nop,ws:flow:016
6:47+17:0:1440:65535,7:mss,nop,nop,sok,nop,ws:flow:016
6:54+10:0:1440:65535,7:mss,nop,nop,sok,nop,ws:flow:011
6:45+19:0:1440:65535,7:mss,nop,nop,sok,nop,ws:flow:09
6:56+8:0:1440:65535,7:mss,nop,nop,sok,nop,ws:flow:08
6:52+12:0:1440:65535,7:mss,nop,nop,sok,nop,ws:flow:04

User-Agent

fingerprintco-occurrences
curl/8.14.1115
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.3645
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.3610
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.368
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/152.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
CN · China62
US · United States21
GB · United Kingdom10
DE · Germany7
HK · Hong Kong SAR China6
SE · Sweden6
NO · Norway5
NL · Netherlands5
JP · Japan5
CH · Switzerland5

Network (ASN)

fingerprintco-occurrences
AS9009 · M247 Europe SRL44
AS4837 · CHINA UNICOM China169 Backbone32
AS212238 · Datacamp Limited21
AS60068 · Datacamp Limited20
AS396356 · Latitude.sh8
AS4134 · CHINANET BACKBONE7
AS63023 · GTHost6
AS51852 · Private Layer INC4
AS56040 · China Mobile communications corporation4
AS56044 · China Mobile communications corporation4

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.22.1, python-httpx 0.28.1, python-requests 2.34.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog.115
0a0a,11ec,001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 155.0.8059.40, chrome 156.0.8078.73, chromium 156.0.8078.47, +8 more.The fingerprint page shows the full measured match list. More on the catalog.9

Cross-transport links

TLS ClientHello fingerprints observed from the same client via the beacon's correlation id on the other transport (e.g. this stack over TCP ↔ that stack over QUIC).

fingerprintlinked observations
q13d0311h3_55b375c5d22e_653d80c3fe9d6