TCP SYN (JA4T)

65535_2-1-1-4-1-3_1460_7

first seen 2026-07-06 03:45 · last seen 2026-10-27 11:59 · JSON

Last 7 days (6 observations)

Distinct clients per day (last 30 days, peak 21/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 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
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.29
t13d3013h2_1d37bd780c83_8537cf56674e21
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.9

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn030000_bf75ddd0bb29_000000000000_00000000000021
ge20nn13zhcn_30dc68305204_000000000000_00000000000012
ge20nn13zhcn_0c2c1d640f3e_000000000000_00000000000011
ge20nr12zhcn_54b4638ab28b_000000000000_0000000000005
ge20nn13zhcn_9519c2577190_000000000000_0000000000005
ge20nr12vivn_54b4638ab28b_000000000000_0000000000003
ge20nr12zhcn_9c600a72754c_000000000000_0000000000002

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, +57 more.The fingerprint page shows the full measured match list. More on the catalog.22
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.21
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.9
1:65536;2:0;4:6291456;6:262144|15663105|3:1:0:256|m,a,s,p6
1:65536;2:0;4:6291456;6:262144|15663105|3:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 151.0.7922.34, chromium 147.0.7727.15, chromium 145.0.7632.6, +26 more.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (p0f)

fingerprintco-occurrences
4:44+20:0:1460:65535,7:mss,nop,nop,sok,nop,ws:df,id+:08
4:42+22:0:1460:65535,7:mss,nop,nop,sok,nop,ws:df,id+:08
4:47+17:0:1460:65535,7:mss,nop,nop,sok,nop,ws:df,id+:07
4:45+19:0:1460:65535,7:mss,nop,nop,sok,nop,ws:df,id+:06
4:48+16:0:1460:65535,7:mss,nop,nop,sok,nop,ws:df,id+:06
4:56+8:0:1460:65535,7:mss,nop,nop,sok,nop,ws:df,id+:05
4:54+10:0:1460:65535,7:mss,nop,nop,sok,nop,ws:df,id+:04
4:50+14:0:1460:65535,7:mss,nop,nop,sok,nop,ws:df,id+:04
4:52+12:0:1460:65535,7:mss,nop,nop,sok,nop,ws:df,id+:03
4:46+18:0:1460:65535,7:mss,nop,nop,sok,nop,ws:df,id+:02

User-Agent

fingerprintco-occurrences
curl/8.14.121
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/142.0.0.0 Safari/537.3610
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.369

Country

fingerprintco-occurrences
CN · China35
US · United States10
FR · France2
AU · Australia1
DE · Germany1
NO · Norway1
NL · Netherlands1
JP · Japan1
CH · Switzerland1
CA · Canada1

Network (ASN)

fingerprintco-occurrences
AS9808 · China Mobile Communications Group Co., Ltd.11
AS56041 · China Mobile communications corporation11
AS212238 · Datacamp Limited10
AS46475 · Limestone Networks, Inc.6
AS9009 · M247 Europe SRL4
AS4837 · CHINA UNICOM China169 Backbone3
AS58461 · CT HangZhou IDC2
AS60068 · Datacamp Limited2
AS56046 · China Mobile communications corporation2
AS396356 · Latitude.sh1

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.21
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.6

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_653d80c3fe9d7