TCP SYN (JA4T)

65535_2-1-3-1-1-4_1392_8

first seen 2026-07-01 15:48 · last seen 2026-08-28 04:02 · JSON

Distinct clients per day (last 30 days, peak 4/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 kinds2-1-3-1-1-4
MSS1392
Window scale8

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, +24 more.The fingerprint page shows the full measured match list. More on the catalog.13
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.11
t13d1312h2_f57a46bbacb6_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.8, go-net/http 1.26.7, +5 more.The fingerprint page shows the full measured match list. More on the catalog.3
t13d201200_2b729b4bf6f3_e24568c0d4402
t13d3013h1_1d37bd780c83_8537cf56674e1

HTTP request (JA4H)

fingerprintco-occurrences
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.7
ge20nr12es41_54b4638ab28b_000000000000_0000000000006
ge20nr12engb_54b4638ab28b_000000000000_0000000000003
ge20nr13enus_5907f7c6644a_000000000000_0000000000003
ge20nn13es41_9519c2577190_000000000000_0000000000002
ge20nn14enus_3fb598f484fb_000000000000_0000000000001
ge20nr14enus_3fb598f484fb_000000000000_0000000000001
ge20nn13engb_9519c2577190_000000000000_0000000000001
po11nn07enid_7d361e250c48_000000000000_0000000000001
ge20nn13enus_e72c373a2aa3_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, +43 more.The fingerprint page shows the full measured match list. More on the catalog.11
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.8
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, +21 more.The fingerprint page shows the full measured match list. More on the catalog.4
2:0;4:4194304;5:16384;6:10485760|1073741824|0|a,m,p,s Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.8, go-net/http 1.26.7, +6 more.The fingerprint page shows the full measured match list. More on the catalog.3
1:65536;2:0;4:6291456;6:262144|15663105|7:1:0:256|m,a,s,p1

TCP SYN (p0f)

fingerprintco-occurrences
6:52+12:0:1392:65535,8:mss,nop,ws,nop,nop,sok:flow:09
6:49+15:0:1392:65535,8:mss,nop,ws,nop,nop,sok:flow:07
6:55+9:0:1392:65535,8:mss,nop,ws,nop,nop,sok:flow:05
6:47+17:0:1392:65535,8:mss,nop,ws,nop,nop,sok:flow:02
6:46+18:0:1392:65535,8:mss,nop,ws,nop,nop,sok:flow:02
6:48+16:0:1392:65535,8:mss,nop,ws,nop,nop,sok:flow:02
6:53+11:0:1392:65535,8:mss,nop,ws,nop,nop,sok:flow:01
6:56+8:0:1392:65535,8:mss,nop,ws,nop,nop,sok:flow:01
6:42+22:0:1392:65535,8:mss,nop,ws,nop,nop,sok:flow:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.3610
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36 Edg/150.0.0.05
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Safari/537.364
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.364
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.36 Edg/151.0.0.04
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 6.2; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 6.3; arm64) AppleWebKit/537.36 (KHTML, like Gecko) Edge/98.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
MX · Mexico9
BR · Brazil5
TR · Turkey5
MY · Malaysia4
ID · Indonesia3
PH · Philippines2
TH · Thailand1
SA · Saudi Arabia1

Network (ASN)

fingerprintco-occurrences
AS8151 · Uninet S.A. de C.V.9
AS34984 · Superonline Iletisim Hizmetleri A.S.5
AS9930 · TTNET4
AS133481 · AIS Fibre1
AS25019 · Saudi Telecom Company JSC1
AS9299 · Philippine Long Distance Telephone Company1
AS28573 · Claro NXT Telecomunicacoes Ltda1
AS7713 · PT Telekomunikasi Indonesia1
AS53006 · ALGAR TELECOM S/A1
AS63859 · PT. Eka Mas Republik1

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_653d80c3fe9d12