TCP SYN (JA4T)

64240_2-4-8-1-3_1380_7

first seen 2026-06-29 23:25 · last seen 2026-09-15 02:07 · JSON

Last 7 days (3 observations)

Distinct clients per day (last 30 days, peak 8/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 window64240
Option kinds2-4-8-1-3
MSS1380
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
t13d4412h1_fd39b124ee10_58ed7828516f15
t13d1515h1_8daaf6152771_de4a06bb82e313
t13d1515h1_8daaf6152771_0a20fe35d3a58
t13d4312h1_c7886603b240_b26ce05bbdd66
t13d1516h1_8daaf6152771_1a63afa7c4784
t12d520500_26e41e4f9c7e_22a92d800fe42
t13i170900_5b57614c22b0_78e6aca7449b2
t13d1516h2_8daaf6152771_e5627efa2ab11
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, +24 more.The fingerprint page shows the full measured match list. More on the catalog.1
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

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn13enus_9db22d02e17a_000000000000_00000000000020
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.15
ge11nn14enus_4a2973d235de_000000000000_0000000000005
he11nn06ja00_fb4afd1f380a_000000000000_0000000000003
ge11nn06ja00_fb4afd1f380a_000000000000_0000000000003
ge20nn12enus_60f823d07c94_000000000000_0000000000001
ge11nr14enus_c451fb7d26e2_000000000000_0000000000001
ge11nr14enus_a6a42a658e4d_000000000000_0000000000001
ge20nr12engb_54b4638ab28b_000000000000_0000000000001
ge20nn13enus_0c2c1d640f3e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 151.0.7922.137, chrome 151.0.7922.170, chrome 151.0.7922.108, +23 more.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;3:1000;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p1
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 149.0.7827.102, +59 more.The fingerprint page shows the full measured match list. More on the catalog.1
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, +43 more.The fingerprint page shows the full measured match list. More on the catalog.1
1:65536;2:0;4:6291456;6:262144;4:1048576|15663105|1:0:0:256|m,a,s,p1

TCP SYN (p0f)

fingerprintco-occurrences
4:41+23:0:1380:mss*44,7:mss,sok,ts,nop,ws:df,id+:010
4:46+18:0:1380:mss*44,7:mss,sok,ts,nop,ws:df,id+:09
4:47+17:0:1380:mss*44,7:mss,sok,ts,nop,ws:df,id+:08
4:48+16:0:1380:mss*44,7:mss,sok,ts,nop,ws:df,id+:05
4:49+15:0:1380:mss*44,7:mss,sok,ts,nop,ws:df,id+:04
4:39+25:0:1380:mss*44,7:mss,sok,ts,nop,ws:df,id+:03
4:40+24:0:1380:mss*44,7:mss,sok,ts,nop,ws:df,id+:03
4:52+12:0:1380:mss*44,7:mss,sok,ts,nop,ws:df,id+:03
4:39+25:0:1380:mss*44,7:mss,sok,ts,nop,ws::02
4:54+10:0:1380:mss*44,7:mss,sok,ts,nop,ws:df,id+:02

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.364
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.363
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.363
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.363
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.363
libredtail-http2
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.362
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
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Safari/537.36 Edg/149.0.0.02
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/117.02

Country

fingerprintco-occurrences
AE · United Arab Emirates19
JP · Japan6
KW · Kuwait5
ZA · South Africa4
PR · Puerto Rico3
US · United States2
BR · Brazil2
MX · Mexico2
FR · France2
AR · Argentina2

Network (ASN)

fingerprintco-occurrences
AS15802 · Emirates Integrated Telecommunications Company PJSC19
AS2516 · KDDI CORPORATION6
AS47589 · Kuwait Telecommunications Company K.S.C.C.5
AS10396 · DATACOM CARIBE, INC.3
AS11664 · Techtel LMDS Comunicaciones Interactivas S.A.2
AS19555 · Kinder Morgan, Inc.2
AS28548 · Cablevisión, S.A. de C.V.2
AS9051 · IncoNet Data Management sal2
AS36994 · Vodacom2
AS268335 · ORACLON TELECOM2

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_653d80c3fe9d1