TCP SYN (JA4T)
64240_2-4-8-1-3_1440_7
first seen 2026-06-29 23:11 · last seen 2026-09-16 06:16 · JSON
Last 7 days (26 observations)
Distinct clients per day (last 30 days, peak 51/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 | 64240 |
|---|---|
| Option kinds | 2-4-8-1-3 |
| MSS | 1440 |
| Window scale | 7 |
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 | 338 |
t13d1515h1_8daaf6152771_de4a06bb82e3 | 111 |
t13d1515h1_8daaf6152771_0a20fe35d3a5 | 101 |
t13i190800_9dc949149365_97f8aa674fd9 | 33 |
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. | 12 |
t13d1516h1_8daaf6152771_1a63afa7c478 | 12 |
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. | 8 |
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. | 7 |
t13d5212h1_b262b3658495_8e6e362c5eac Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.19.0, node-fetch 22.23.1, node-fetch 24.21.0, +6 more.The fingerprint page shows the full measured match list. More on the catalog. | 4 |
t12d130600_2d7513195f68_e51b7354d87f | 3 |
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. | 339 |
ge11nn13enus_9db22d02e17a_000000000000_000000000000 | 157 |
ge11nn14enus_4a2973d235de_000000000000_000000000000 | 67 |
ge11nr040000_e1d2031bdfea_000000000000_000000000000 | 36 |
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. | 10 |
ge20nn050000_282098a6f928_000000000000_000000000000 | 6 |
ge20nn010000_379fadc6c8b7_000000000000_000000000000 | 6 |
ge11nn12enus_c0f67fd42004_000000000000_000000000000 | 4 |
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. | 4 |
ge11nn040000_66d37a417839_000000000000_000000000000 | 3 |
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, +43 more.The fingerprint page shows the full measured match list. More on the catalog. | 19 |
1:65536;2:0;4:6291456;6:262144|15663105|0|m,a,s,p | 7 |
2:0;4:4194304;3:100|10485760|0|m,s,p,a Match?Exact match in Thumbprint's published controlled catalog captures: urlsession 6.1.2.The fingerprint page shows the full measured match list. More on the catalog. | 3 |
2:0;4:2097152;5:16384;6:16384|5177345|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.13.4, rust-reqwest 0.12.28, rust-reqwest 0.13.5, +3 more.The fingerprint page shows the full measured match list. More on the catalog. | 2 |
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. | 2 |
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. | 1 |
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. | 1 |
1:4096;2:0;4:2147483647;5:131072;8:0;3:100;6:65536|2147418112|0|m,s,p,a | 1 |
TCP SYN (p0f)
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
BR · Brazil | 201 |
CO · Colombia | 87 |
US · United States | 60 |
CL · Chile | 58 |
AR · Argentina | 51 |
UA · Ukraine | 19 |
ZA · South Africa | 17 |
BD · Bangladesh | 17 |
RU · Russia | 15 |
UZ · Uzbekistan | 13 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS8075 · Microsoft Corporation | 75 |
AS3816 · COLOMBIA TELECOMUNICACIONES S.A. ESP BIC | 68 |
AS7418 · TELEFÓNICA CHILE S.A. | 53 |
AS22927 · Telefonica de Argentina | 42 |
AS26599 · TELEFÔNICA BRASIL S.A | 18 |
AS27699 · TELEFÔNICA BRASIL S.A | 14 |
AS52468 · UFINET PANAMA S.A. | 6 |
AS12365 · ISP Sarkor Telecom | 6 |
AS12389 · PJSC Rostelecom | 6 |
AS9541 · Cyber Internet Services (Pvt) Ltd. | 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 | 1 |