TCP SYN (JA4T)

65535_2-1-3-1-1-4_1300_8

first seen 2026-07-05 06:19 · last seen 2026-09-13 10:13 · JSON

Last 7 days (1 observations)

Distinct clients per day (last 30 days, peak 3/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
MSS1300
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_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.6
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.5
t13d2013h1_2b729b4bf6f3_e24568c0d4402
t13d2913h1_723694b0fccc_5671b5df50291
t13d1812h1_85036bcba153_b26ce05bbdd61
t13d5212h1_b262b3658495_8e6e362c5eac Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.19.0, node-fetch 22.23.1, node-fetch 24.21.0, +6 more.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr16nlnl_94fdc06e0694_000000000000_0000000000004
ge20nr14en00_a482706b3270_000000000000_0000000000003
ge11nn030000_fe444ad14866_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.16.0.The fingerprint page shows the full measured match list. More on the catalog.2
ge20nr15en00_a74bbbf41db7_000000000000_0000000000001
ge11nr11nlnl_835281d8e5d9_000000000000_0000000000001
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.1
ge20nr13enin_5907f7c6644a_000000000000_0000000000001
ge20nn16itit_94fdc06e0694_000000000000_0000000000001
ge20nr16itit_94fdc06e0694_000000000000_0000000000001
ge20nn05*000_754588453448_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.7
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.3
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.1
2:0;4:262144|458753|0|a,m,p,s Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 26.4.0.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (p0f)

fingerprintco-occurrences
4:115+13:0:1300:65535,8:mss,nop,ws,nop,nop,sok:df,id+:04
6:41+23:0:1300:65535,8:mss,nop,ws,nop,nop,sok:flow:04
4:109+19:0:1300:65535,8:mss,nop,ws,nop,nop,sok:df,id+:03
4:113+15:0:1300:65535,8:mss,nop,ws,nop,nop,sok:df,id+:02
4:114+14:0:1300:65535,8:mss,nop,ws,nop,nop,sok:df,id+:01
4:110+18:0:1300:65535,8:mss,nop,ws,nop,nop,sok:df,id+:01
6:237+18:0:1300:65535,8:mss,nop,ws,nop,nop,sok:flow:01

User-Agent

fingerprintco-occurrences
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 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36 OPR/135.0.0.02
Mozilla/5.0 (Linux; Android 12; Pixel 6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Mobile Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.361
curl/8.17.01
curl/8.21.01
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.361
Mozilla/5.0 (Linux; Android 14; 23127PN0CC) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Mobile Safari/537.361
Mozilla/5.0 (Linux; Android 14; 23054RA19C) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Mobile Safari/537.361
Mozilla/5.0 (iPhone; CPU iPhone OS 18_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/150.0.0.0 Mobile/15E148 Safari/604.11

Country

fingerprintco-occurrences
IN · India8
NL · Netherlands5
IT · Italy2
CN · China1

Network (ASN)

fingerprintco-occurrences
AS33915 · Vodafone Libertel B.V.5
AS55836 · Reliance Jio Infocomm Limited4
AS45609 · Bharti Airtel Ltd. AS for GPRS Service4
AS30722 · Fastweb SpA2
AS56040 · China Mobile communications corporation1

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_653d80c3fe9d4