TCP SYN (JA4T)
65535_2-1-3-1-1-4_1440_8
first seen 2026-06-30 02:27 · last seen 2026-11-02 04:06 · JSON
Last 7 days (45 observations)
Distinct clients per day (last 30 days, peak 34/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 window | 65535 |
|---|---|
| Option kinds | 2-1-3-1-1-4 |
| MSS | 1440 |
| Window scale | 8 |
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)
| fingerprint | co-occurrences |
|---|---|
t13d201100_2b729b4bf6f3_36bf25f296df | 942 |
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. | 239 |
t13d1518h2_8daaf6152771_e2d80978ab2e Match?Exact match in Thumbprint's published controlled catalog captures: chrome 152.0.7977.83, chrome 156.0.8078.48, chrome 154.0.8037.57, +27 more.The fingerprint page shows the full measured match list. More on the catalog. | 148 |
t13d1517h2_8daaf6152771_cb7bf5808d99 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 152.0.7977.83, chrome 156.0.8078.48, chrome 154.0.8037.57, +27 more.The fingerprint page shows the full measured match list. More on the catalog. | 56 |
t13d1312h2_f57a46bbacb6_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.10, go-net/http 1.26.9, +7 more.The fingerprint page shows the full measured match list. More on the catalog. | 35 |
t13d2913h1_723694b0fccc_5671b5df5029 | 35 |
t13d181100_85036bcba153_d41ae481755e | 30 |
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. | 26 |
t13d3112h2_e8f1e7e78f70_b26ce05bbdd6 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.5.0, php-curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog. | 24 |
t13d4312h1_c7886603b240_b26ce05bbdd6 | 18 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge11nn16enus_a27292610b04_000000000000_000000000000 | 725 |
ge11nn010000_4a823118b9ba_000000000000_000000000000 | 196 |
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. | 82 |
ge20nn020000_5594a17e7e7e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.13.0, +11 more.The fingerprint page shows the full measured match list. More on the catalog. | 36 |
ge20nn14zhcn_00c893c2b404_000000000000_000000000000 | 34 |
ge20nr12zhcn_54b4638ab28b_000000000000_000000000000 | 29 |
ge11nn06enus_a89d28968959_000000000000_000000000000 | 29 |
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. | 25 |
he11nn020000_d5c75abc5c2c_000000000000_000000000000 | 18 |
ge11nn030000_fe444ad14866_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.16.0, curl 7.88.1, curl 8.21.0, +1 more.The fingerprint page shows the full measured match list. More on the catalog. | 16 |
HTTP/2 frames (Akamai)
| fingerprint | co-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. | 155 |
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 1.26.10, go-net/http 1.26.9, +8 more.The fingerprint page shows the full measured match list. More on the catalog. | 83 |
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. | 56 |
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. | 22 |
2:0;4:65535|67043329|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: powershell 7.6.6, powershell 7.6.9, powershell 7.6.8.The fingerprint page shows the full measured match list. More on the catalog. | 21 |
1:65536;2:0;4:6291456;6:262144|15663105|1:0:0:256|m,a,s,p | 15 |
1:65536;2:0;4:6291456;6:262144|15663105|0|m,a,s,p | 14 |
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, +26 more.The fingerprint page shows the full measured match list. More on the catalog. | 13 |
1:65536;2:0;4:6291456;6:262144|15663105|7:1:0:256|m,a,s,p | 9 |
1:65536;2:0;4:6291456;6:262144|15663105|5:1:0:256|m,a,s,p | 9 |
TCP SYN (p0f)
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
CN · China | 357 |
US · United States | 223 |
IN · India | 124 |
CA · Canada | 118 |
BR · Brazil | 110 |
KR · South Korea | 100 |
IT · Italy | 91 |
AU · Australia | 81 |
HK · Hong Kong SAR China | 68 |
CH · Switzerland | 63 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS8075 · Microsoft Corporation | 1073 |
AS4134 · CHINANET BACKBONE | 292 |
AS4837 · CHINA UNICOM China169 Backbone | 65 |
AS28573 · Claro NXT Telecomunicacoes Ltda | 30 |
AS3209 · Vodafone GmbH | 23 |
AS50187 · BaikalWestCom Ltd | 15 |
AS7545 · TPG Telecom Limited | 13 |
AS55836 · Reliance Jio Infocomm Limited | 10 |
AS24309 · Atria Convergence Technologies Pvt. Ltd. Broadband Internet Service Provider INDIA | 7 |
AS210278 · Sky Italia srl | 7 |
TLS supported groups
| fingerprint | co-occurrences |
|---|---|
001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.12.28, rust-reqwest 0.11.27, winhttp 10.0.20348.1, +2 more.The fingerprint page shows the full measured match list. More on the catalog. | 94 |
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. | 24 |
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. | 19 |
0a0a,001d,0017,0018 | 7 |
0018,0017 Match?Exact match in Thumbprint's published controlled catalog captures: powershell 7.6.7, powershell 5.1.26100.33648, curl 8.21.0.The fingerprint page shows the full measured match list. More on the catalog. | 5 |
11ec,11eb,11ed,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.27.3, go-net/http 1.26.10.The fingerprint page shows the full measured match list. More on the catalog. | 3 |
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. | 2 |
0a0a,6399,001d,0017,0018 | 1 |
0017,0019,001c,001b,0018,001a,0016,000e,000d,000b,000c,0009,000a | 1 |
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).
| fingerprint | linked observations |
|---|---|
q13d0311h3_55b375c5d22e_653d80c3fe9d | 26 |
q13d0312h3_55b375c5d22e_178839b6cec1 | 9 |
q13d0315h3_55b375c5d22e_dc5437974b47 | 8 |