TCP SYN (JA4T)

42340_2-1-1-4-1-3_1460_11

first seen 2026-07-06 02:39 · last seen 2026-10-22 01:58 · JSON

Distinct clients per day (last 30 days, peak 22/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 window42340
Option kinds2-1-1-4-1-3
MSS1460
Window scale11

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
t12d290700_fc2078a0b8c0_8c06664c3ac520
t13d3113h2_e8f1e7e78f70_1b3407e2c9369
t12d130600_2d7513195f68_e51b7354d87f8
t13d1510h2_8daaf6152771_5603904660158
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.6
t13d1516h2_8daaf6152771_e5627efa2ab16
t13d1512h2_8daaf6152771_cbb9361b6bf95
t13d1715h2_5b57614c22b0_a54fffd0eb614
t13d1310h2_ccf33812d0e6_5603904660153
t13d1210h2_d43df876c88e_5603904660152

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn04enus_989c7cc05c9b_000000000000_000000000000177
ge20nn12enus_60f823d07c94_000000000000_00000000000011
ge11nn040000_bfa5a9b89dd6_000000000000_00000000000010
ge11nn06en00_3011d71998e2_000000000000_00000000000010
ge20nr020000_5594a17e7e7e_000000000000_0000000000009
ge11nr040000_e1d2031bdfea_000000000000_0000000000008
ge20nr11enus_187a9385d229_000000000000_0000000000004
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, +36 more.The fingerprint page shows the full measured match list. More on the catalog.2
ge11nn06enus_21ea1759749c_000000000000_0000000000002
ge20nn12enus_a72b71f519fc_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:6291456;6:262144;4:1048576|15663105|1:0:0:256|m,a,s,p177
3:100;4:33554432;2:0|33488897|0|m,p,s,a Match?Exact match in Thumbprint's published controlled catalog captures: php-curl 7.88.1, curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.9
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, +57 more.The fingerprint page shows the full measured match list. More on the catalog.8
1:65536;2:0;3:1000;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p4
1:65536;2:0;4:131072;5:16384|12517377|3:0:0:22|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 155.0.1, +31 more.The fingerprint page shows the full measured match list. More on the catalog.2
1:65536;3:1000;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p2
1:65536;2:0;4:131072;5:16384|12517377|1:0:0:42|m,p,a,s2
2:0;4:4194304;3:100|10485760|1:0:0:255|m,s,p,a1
1:65536;2:0;4:131072;5:16384|12517377|5:0:0:22|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0.3, firefox 154.0, firefox 153.0, +12 more.The fingerprint page shows the full measured match list. More on the catalog.1
1:65536;2:0;4:131072;5:16384|12517377|7:0:0:22|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0.3, firefox 155.0, firefox 154.0, +3 more.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (p0f)

fingerprintco-occurrences
4:50+14:0:1460:mss*29,11:mss,nop,nop,sok,nop,ws:df,id+:0204
4:53+11:0:1460:mss*29,11:mss,nop,nop,sok,nop,ws::09
4:54+10:0:1460:mss*29,11:mss,nop,nop,sok,nop,ws::06
4:49+15:0:1460:mss*29,11:mss,nop,nop,sok,nop,ws:df,id+:04
4:53+11:0:1460:mss*29,11:mss,nop,nop,sok,nop,ws:df,id+:04
4:54+10:0:1460:mss*29,11:mss,nop,nop,sok,nop,ws:df,id+:03
4:43+21:0:1460:mss*29,11:mss,nop,nop,sok,nop,ws::02
4:55+9:0:1460:mss*29,11:mss,nop,nop,sok,nop,ws::02
4:57+7:0:1460:mss*29,11:mss,nop,nop,sok,nop,ws:df,id+:02
4:44+20:0:1460:mss*29,11:mss,nop,nop,sok,nop,ws:df,id+:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)20
Mozilla/5.0 (Windows NT 5.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.368
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.367
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.4 Safari/537.366
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.5 Safari/537.366
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.1 Safari/537.366
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.7 Safari/537.365
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.8 Safari/537.365
Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.04
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.3 Safari/537.364

Country

fingerprintco-occurrences
DE · Germany226
MN · Mongolia8
AT · Austria3
US · United States2

Network (ASN)

fingerprintco-occurrences
AS60729 · Stiftung Erneuerbare Freiheit209
AS197540 · netcup GmbH20
AS45204 · GEMNET LLC8
AS8796 · FASTNET DATA INC2

TLS supported groups

fingerprintco-occurrences
001d,0017,001e,0019,00184
0017,0018,00192