TCP SYN (JA4T)

65535_2-4-8-1-3_1452_10

first seen 2026-07-01 18:17 · last seen 2026-11-01 17:16 · JSON

Last 7 days (33 observations)

Distinct clients per day (last 30 days, peak 19/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
MSS1452
Window scale10

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_58ed7828516f95
t13d1515h1_8daaf6152771_de4a06bb82e349
t13d1515h1_8daaf6152771_0a20fe35d3a546
t13d131100_f57a46bbacb6_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.5, go-net/http 1.26.4.The fingerprint page shows the full measured match list. More on the catalog.32
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
t13d1513h2_8daaf6152771_eca864cca44a9
t13d1516h1_8daaf6152771_1a63afa7c4787
t13d4312h1_c7886603b240_b26ce05bbdd65

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.100
ge11nn13enus_9db22d02e17a_000000000000_00000000000078
ge11nn14enus_4a2973d235de_000000000000_00000000000024
ge20nn030000_80b089f68b8e_000000000000_0000000000009
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, +39 more.The fingerprint page shows the full measured match list. More on the catalog.6
ge11nr19frfr_4e9b73ab7510_000000000000_0000000000004
ge11nr19enus_4e9b73ab7510_000000000000_0000000000003
ge11nr17zhcn_021c223ca66c_000000000000_0000000000003
ge20nr12enus_54b4638ab28b_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 152.0.7977.83, chrome 151.0.7922.137, +61 more.The fingerprint page shows the full measured match list. More on the catalog.2
ge11nr15frfr_944d72baa157_000000000000_0000000000002

HTTP/2 frames (Akamai)

fingerprintco-occurrences
4:16777216|16711681|0|m,p,a,s9
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, +60 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 152.0.7977.83, +85 more.The fingerprint page shows the full measured match list. More on the catalog.2

TCP SYN (p0f)

fingerprintco-occurrences
4:51+13:0:1452:65535,10:mss,sok,ts,nop,ws:df,id+:041
4:44+20:0:1452:65535,10:mss,sok,ts,nop,ws:df,id+:025
4:49+15:0:1452:65535,10:mss,sok,ts,nop,ws:df,id+:022
4:45+19:0:1452:65535,10:mss,sok,ts,nop,ws:df,id+:021
4:46+18:0:1452:65535,10:mss,sok,ts,nop,ws:df,id+:020
4:42+22:0:1452:65535,10:mss,sok,ts,nop,ws:df,id+:020
4:52+12:0:1452:65535,10:mss,sok,ts,nop,ws:df,id+:016
4:50+14:0:1452:65535,10:mss,sok,ts,nop,ws:df,id+:015
4:53+11:0:1452:65535,10:mss,sok,ts,nop,ws:df,id+:012
4:41+23:0:1452:65535,10:mss,sok,ts,nop,ws:df,id+:011

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.3611
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.3610
Harmonic-HN-Android/3.0.1/release9
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.75 Safari/537.369
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.67 Safari/537.369
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.368
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.368
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.367
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.367
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.367

Country

fingerprintco-occurrences
ZA · South Africa77
PK · Pakistan48
AE · United Arab Emirates33
ET · Ethiopia18
CA · Canada12
KE · Kenya9
MA · Morocco8
BD · Bangladesh7
BR · Brazil5
NP · Nepal5

Network (ASN)

fingerprintco-occurrences
AS17557 · Pakistan Telecommunication Company Limited40
AS5384 · Emirates Internet31
AS328471 · HERO TELECOMS (PTY) LTD24
AS24757 · Ethio Telecom18
AS36994 · Vodacom13
AS577 · Bell Canada12
AS20011 · Dimension Data7
AS16637 · MTN SA7
AS36925 · MEDITELECOM6
AS37457 · Telkom SA Ltd.6

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 158.0.1, firefox 157.0, firefox 157.0.1, +5 more.The fingerprint page shows the full measured match list. More on the catalog.32
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.3
0a0a,11ec,001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 156.0.8078.48, edge 155.0.4283.62, chrome 156.0.8078.47, +11 more.The fingerprint page shows the full measured match list. More on the catalog.2
0a0a,001d,0017,00182