TCP SYN (JA4T)

65535_2-4-8-1-3_1432_9

first seen 2026-07-20 05:33 · last seen 2026-10-17 17:54 · JSON

Distinct clients per day (last 30 days, peak 1/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 kinds2-4-8-1-3
MSS1432
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
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.3
t13d4412h1_fd39b124ee10_58ed7828516f3
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.3
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.1
t13d4312h1_c7886603b240_b26ce05bbdd61
t13d1515h1_8daaf6152771_0a20fe35d3a51
t13d1615h2_86a278354501_5c2c66f702b01
t13d1713h1_5b57614c22b0_eca864cca44a1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn050000_b223a0ebb0b5_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.34.2, python-requests 2.33.1, python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog.4
ge20nr14zhcn_e6dae214b9be_000000000000_0000000000002
ge20nr10engb_b3034183f430_000000000000_0000000000001
ge11nn14enus_4a2973d235de_000000000000_0000000000001
ge20nn11enus_dbdd560af68b_000000000000_0000000000001
ge20nn14zhcn_00c893c2b404_000000000000_0000000000001
ge11nn05es00_ec73517afef7_000000000000_0000000000001
ge20nr12eses_909b5e95348b_000000000000_0000000000001
ge20nr12eses_54b4638ab28b_000000000000_0000000000001
ge20nr14eses_3920ee50bd52_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, +57 more.The fingerprint page shows the full measured match list. More on the catalog.4
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.2
1:4096;2:0;4:32768;5:16384|12517377|3:0:0:22|m,p,a,s1
1:65536;2:0;4:6291456;6:262144|15663105|7:1:0:256|m,a,s,p1

TCP SYN (p0f)

fingerprintco-occurrences
6:47+17:0:1432:65535,9:mss,sok,ts,nop,ws:flow:03
6:237+18:0:1432:65535,9:mss,sok,ts,nop,ws:flow:03
4:49+15:0:1432:65535,9:mss,sok,ts,nop,ws:df,id+:02
4:46+18:0:1432:65535,9:mss,sok,ts,nop,ws:df,id+:01
6:242+13:0:1432:65535,9:mss,sok,ts,nop,ws:flow:01
4:52+12:0:1432:65535,9:mss,sok,ts,nop,ws:df,id+:01
4:44+20:0:1432:65535,9:mss,sok,ts,nop,ws:df,id+:01
6:236+19:0:1432:65535,9:mss,sok,ts,nop,ws:flow:01
4:53+11:0:1432:65535,9:mss,sok,ts,nop,ws:df,id+:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/155.0.0.0 Mobile Safari/537.363
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.361
Mozilla/5.0 (Android 15; Mobile; rv:152.0) Gecko/152.0 Firefox/152.01
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2227.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Brave Chrome/80.0.3987.162 Safari/537.361
WhatsApp/2.23.20.01
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/153.0.0.0 Mobile Safari/537.36 EdgA/153.0.0.01

Country

fingerprintco-occurrences
ES · Spain4
CN · China3
PK · Pakistan2
DE · Germany1
BR · Brazil1
IN · India1
BD · Bangladesh1
EG · Egypt1

Network (ASN)

fingerprintco-occurrences
AS57269 · DIGI SPAIN TELECOM S.A4
AS4134 · CHINANET BACKBONE3
AS136525 · Wancom (Pvt) Ltd.2
AS3320 · Deutsche Telekom AG1
AS8167 · V tal1
AS8452 · TE-AS1
AS23956 · AmberIT Limited1
AS135223 · Netway Internet Pvt Ltd1

TLS supported groups

fingerprintco-occurrences
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.3
001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, php-guzzle 8.3.1, curl 7.88.1, +10 more.The fingerprint page shows the full measured match list. More on the catalog.1
001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.12.28, rust-reqwest 0.11.27, powershell 7.6.8, +1 more.The fingerprint page shows the full measured match list. More on the catalog.1

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
q13d0315h3_55b375c5d22e_dc5437974b471
q13d0312h3_55b375c5d22e_178839b6cec11