TCP SYN (JA4T)

64240_2-4-8-1-3_1440_7

first seen 2026-06-29 23:11 · last seen 2026-11-02 01:46 · JSON

Last 7 days (189 observations)

Distinct clients per day (last 30 days, peak 88/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
MSS1440
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
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.342
t13d4412h1_fd39b124ee10_58ed7828516f338
t13d4312h1_c7886603b240_b26ce05bbdd6141
t13d1515h1_8daaf6152771_de4a06bb82e3140
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.139
t13d1515h1_8daaf6152771_0a20fe35d3a5119
t13i190800_9dc949149365_97f8aa674fd9110
t13d1516h2_8daaf6152771_02713d6af862 Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 134.0.6998.35, chromium 133.0.6943.16.The fingerprint page shows the full measured match list. More on the catalog.21
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.18
t13d1516h1_8daaf6152771_1a63afa7c47812

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.480
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.225
ge11nn13enus_9db22d02e17a_000000000000_000000000000191
ge11nr040000_e1d2031bdfea_000000000000_000000000000113
ge20nr14enau_3fb598f484fb_000000000000_00000000000093
ge11nn14enus_4a2973d235de_000000000000_00000000000080
ge20nr13enau_5907f7c6644a_000000000000_00000000000023
ge20nn010000_379fadc6c8b7_000000000000_00000000000013
ge20nn14enau_3fb598f484fb_000000000000_00000000000012
ge11nr19dede_4e9b73ab7510_000000000000_00000000000010

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, +60 more.The fingerprint page shows the full measured match list. More on the catalog.267
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.14
1:65536;2:0;4:6291456;6:262144|15663105|5:1:0:256|m,a,s,p11
1:65536;2:0;4:6291456;6:262144|15663105|7:1:0:256|m,a,s,p9
1:65536;2:0;4:6291456;6:262144|15663105|0|m,a,s,p9
1:65536;2:0;4:6291456;6:262144|15663105|9:1:0:256|m,a,s,p9
1:65536;2:0;4:6291456;6:262144|15663105|13:1:0:256|m,a,s,p7
1:65536;2:0;4:6291456;6:262144|15663105|15:1:0:256|m,a,s,p7
1:65536;2:0;4:6291456;6:262144|15663105|3:1:0:256|m,a,s,p6
1:65536;2:0;4:6291456;6:262144|15663105|11:1:0:256|m,a,s,p6

TCP SYN (p0f)

fingerprintco-occurrences
4:48+16:0:1440:mss*44,7:mss,sok,ts,nop,ws:df,id+:0252
4:47+17:0:1440:mss*44,7:mss,sok,ts,nop,ws:df,id+:0218
4:46+18:0:1440:mss*44,7:mss,sok,ts,nop,ws:df,id+:0178
4:45+19:0:1440:mss*44,7:mss,sok,ts,nop,ws:df,id+:0139
4:49+15:0:1440:mss*44,7:mss,sok,ts,nop,ws:df,id+:0131
4:50+14:0:1440:mss*44,7:mss,sok,ts,nop,ws:df,id+:0115
4:44+20:0:1440:mss*44,7:mss,sok,ts,nop,ws:df,id+:096
4:43+21:0:1440:mss*44,7:mss,sok,ts,nop,ws:df,id+:056
4:42+22:0:1440:mss*44,7:mss,sok,ts,nop,ws:df,id+:042
4:41+23:0:1440:mss*44,7:mss,sok,ts,nop,ws:df,id+:027

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36212
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/155.0.0.0 Safari/537.36 Edg/155.0.0.0130
Mozilla/5.0 zgrab/0.x113
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.3643
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.3634
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.3632
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.3632
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.3631
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.3628
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.3627

Country

fingerprintco-occurrences
BR · Brazil292
CN · China177
US · United States139
AU · Australia133
CO · Colombia127
CL · Chile72
IT · Italy70
AR · Argentina63
GB · United Kingdom49
VN · Vietnam45

Network (ASN)

fingerprintco-occurrences
AS8075 · Microsoft Corporation303
AS4134 · CHINANET BACKBONE133
AS3816 · COLOMBIA TELECOMUNICACIONES S.A. ESP BIC102
AS7418 · TELEFÓNICA CHILE S.A.65
AS22927 · Telefonica de Argentina50
AS5607 · Sky UK Limited37
AS4837 · CHINA UNICOM China169 Backbone36
AS26599 · TELEFÔNICA BRASIL S.A27
AS210278 · Sky Italia srl26
AS1267 · WIND TRE S.P.A.18

TLS supported groups

fingerprintco-occurrences
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.173
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.141
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.102
001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13, curl 8.7.1.The fingerprint page shows the full measured match list. More on the catalog.40
0a0a,001d,0017,001820
0a0a,6399,001d,0017,00186
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1, python-requests 2.34.2, curl 8.23.0, +4 more.The fingerprint page shows the full measured match list. More on the catalog.2

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
q13d0312h3_55b375c5d22e_178839b6cec12
q13d0311h3_55b375c5d22e_653d80c3fe9d1