TCP SYN (JA4T)
65535_2-4-8-1-3_1440_8
first seen 2026-07-01 14:38 · last seen 2026-09-16 19:53 · JSON
Last 7 days (12 observations)
Distinct clients per day (last 30 days, peak 36/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 | 2-4-8-1-3 |
| 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 |
|---|---|
t13d4412h1_fd39b124ee10_58ed7828516f | 243 |
t13d1515h1_8daaf6152771_de4a06bb82e3 | 127 |
t13d1515h1_8daaf6152771_0a20fe35d3a5 | 95 |
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. | 26 |
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. | 14 |
t13d1516h1_8daaf6152771_1a63afa7c478 | 6 |
t13d1513h2_8daaf6152771_eca864cca44a | 4 |
t13d3013h2_1d37bd780c83_8537cf56674e | 3 |
t13d2013h1_2b729b4bf6f3_e24568c0d440 | 3 |
t13d1515h2_8daaf6152771_e8ed158c4d85 | 2 |
HTTP request (JA4H)
| fingerprint | co-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. | 243 |
ge11nn13enus_9db22d02e17a_000000000000_000000000000 | 169 |
ge11nn14enus_4a2973d235de_000000000000_000000000000 | 59 |
ge20nr13engb_2e13211475bf_000000000000_000000000000 | 15 |
ge20nr13enus_2e13211475bf_000000000000_000000000000 | 7 |
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. | 6 |
ge20nn030000_80b089f68b8e_000000000000_000000000000 | 5 |
ge20nr13enus_762281698773_000000000000_000000000000 | 3 |
ge11nn030000_fe444ad14866_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.16.0.The fingerprint page shows the full measured match list. More on the catalog. | 3 |
ge20nr13enus_b3e540f310f0_000000000000_000000000000 | 2 |
HTTP/2 frames (Akamai)
| fingerprint | co-occurrences |
|---|---|
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:110|m,a,s,p | 27 |
4:16777216|16711681|0|m,p,a,s | 6 |
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:183|m,a,s,p | 6 |
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. | 5 |
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. | 4 |
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. | 4 |
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. | 2 |
1:4096;2:0;4:32768;5:16384|12517377|3:0:0:22|m,p,a,s | 2 |
TCP SYN (p0f)
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
BD · Bangladesh | 142 |
BR · Brazil | 102 |
US · United States | 49 |
PK · Pakistan | 45 |
ZA · South Africa | 35 |
GB · United Kingdom | 23 |
RU · Russia | 22 |
CO · Colombia | 13 |
UA · Ukraine | 9 |
AR · Argentina | 7 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS15169 · Google LLC | 33 |
AS9541 · Cyber Internet Services (Pvt) Ltd. | 23 |
AS7922 · Comcast Cable Communications, LLC | 16 |
AS11845 · Vox Telecom Ltd | 11 |
AS5607 · Sky UK Limited | 11 |
AS3816 · COLOMBIA TELECOMUNICACIONES S.A. ESP BIC | 10 |
AS12389 · PJSC Rostelecom | 8 |
AS14593 · Space Exploration Technologies Corporation | 6 |
AS18881 · TELEFÔNICA BRASIL S.A | 6 |
AS22927 · Telefonica de Argentina | 6 |
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 | 2 |
q13d0315h3_55b375c5d22e_dc5437974b47 | 2 |