TCP SYN (JA4T)
65535_2-1-3-1-1-4_1440_8
first seen 2026-06-30 02:27 · last seen 2026-09-16 15:56 · JSON
Last 7 days (43 observations)
Distinct clients per day (last 30 days, peak 24/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 | 668 |
t13d1518h2_8daaf6152771_e2d80978ab2e Match?Exact match in Thumbprint's published controlled catalog captures: chrome 152.0.7977.83, chrome 152.0.7977.64, chrome 152.0.7977.65, +5 more.The fingerprint page shows the full measured match list. More on the catalog. | 148 |
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. | 92 |
t13d2913h1_723694b0fccc_5671b5df5029 | 35 |
t13d1517h2_8daaf6152771_cb7bf5808d99 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 152.0.7977.83, chrome 152.0.7977.64, chrome 152.0.7977.65, +5 more.The fingerprint page shows the full measured match list. More on the catalog. | 26 |
t13d1812h1_85036bcba153_d41ae481755e | 16 |
t13d1312h2_f57a46bbacb6_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.8, go-net/http 1.26.7, +5 more.The fingerprint page shows the full measured match list. More on the catalog. | 14 |
t13d1812h1_85036bcba153_b26ce05bbdd6 | 14 |
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. | 13 |
t13d181100_85036bcba153_d41ae481755e | 9 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge11nn16enus_a27292610b04_000000000000_000000000000 | 534 |
ge11nn010000_4a823118b9ba_000000000000_000000000000 | 127 |
ge20nn020000_5594a17e7e7e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.18.0, +9 more.The fingerprint page shows the full measured match list. More on the catalog. | 18 |
ge20nr12enus_54b4638ab28b_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 151.0.7922.137, edge 151.0.4129.93, +36 more.The fingerprint page shows the full measured match list. More on the catalog. | 11 |
ge11nn050000_3658ef221638_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: wget 1.21.4, wget 1.21.3, wget 1.25.0.The fingerprint page shows the full measured match list. More on the catalog. | 8 |
ge11nn06enus_a89d28968959_000000000000_000000000000 | 8 |
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. | 7 |
ge11nr11enau_835281d8e5d9_000000000000_000000000000 | 7 |
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, +23 more.The fingerprint page shows the full measured match list. More on the catalog. | 6 |
ge11nn06enus_fb4afd1f380a_000000000000_000000000000 | 6 |
HTTP/2 frames (Akamai)
| fingerprint | co-occurrences |
|---|---|
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 1.26.8, go-net/http 1.26.7, +6 more.The fingerprint page shows the full measured match list. More on the catalog. | 56 |
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. | 55 |
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. | 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 | 13 |
1:65536;2:0;4:6291456;6:262144|15663105|9:0:0:256|m,a,s,p | 8 |
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 154.0, +25 more.The fingerprint page shows the full measured match list. More on the catalog. | 6 |
3:100;4:10485760;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0.The fingerprint page shows the full measured match list. More on the catalog. | 6 |
3:100;4:65536;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, curl 8.18.0, curl 8.21.0, +7 more.The fingerprint page shows the full measured match list. More on the catalog. | 6 |
1:65536;2:0;4:6291456;6:262144|15663105|13:0:0:256|m,a,s,p | 6 |
TCP SYN (p0f)
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
CN · China | 238 |
US · United States | 160 |
CA · Canada | 114 |
IT · Italy | 84 |
BR · Brazil | 60 |
CH · Switzerland | 50 |
MX · Mexico | 49 |
PL · Poland | 36 |
IN · India | 33 |
DE · Germany | 29 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS8075 · Microsoft Corporation | 704 |
AS4134 · CHINANET BACKBONE | 238 |
AS28573 · Claro NXT Telecomunicacoes Ltda | 14 |
AS7545 · TPG Telecom Limited | 13 |
AS7922 · Comcast Cable Communications, LLC | 6 |
AS3209 · Vodafone GmbH | 6 |
AS7018 · AT&T Enterprises, LLC | 5 |
AS393886 · Leaseweb USA, Inc. | 5 |
AS6799 · Ote SA (Hellenic Telecommunications Organisation) | 5 |
AS1267 · WIND TRE S.P.A. | 5 |
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 | 14 |
q13d0315h3_55b375c5d22e_dc5437974b47 | 7 |
q13d0312h3_55b375c5d22e_178839b6cec1 | 6 |