TCP SYN (JA4T)
64240_2-1-3-1-1-4_1440_8
first seen 2026-06-29 23:30 · last seen 2026-09-17 20:59 · JSON
Last 7 days (12 observations)
Distinct clients per day (last 30 days, peak 13/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 | 2-1-3-1-1-4 |
| 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 |
|---|---|
t13d2212h2_231e334592e8_36bf25f296df | 103 |
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. | 27 |
t13d1717h2_5b57614c22b0_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 148.0.2, firefox 144.0.2, firefox 142.0.1, +6 more.The fingerprint page shows the full measured match list. More on the catalog. | 18 |
t13d2913h1_723694b0fccc_5671b5df5029 | 17 |
t13d1716h2_5b57614c22b0_0c27189014cf Match?Exact match in Thumbprint's published controlled catalog captures: firefox 148.0.2, firefox 144.0.2, firefox 142.0.1, +6 more.The fingerprint page shows the full measured match list. More on the catalog. | 14 |
t13d1617h2_86a278354501_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 152.0.3, +10 more.The fingerprint page shows the full measured match list. More on the catalog. | 12 |
t13d1913h2_9dc949149365_9249cab70c77 | 11 |
t13d131100_f57a46bbacb6_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.5, go-net/http 1.26.4.The fingerprint page shows the full measured match list. More on the catalog. | 11 |
t13d1515h1_8daaf6152771_0a20fe35d3a5 | 4 |
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. | 4 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge20nr10enus_b3034183f430_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 154.0, +21 more.The fingerprint page shows the full measured match list. More on the catalog. | 20 |
ge20nn040000_272467e735d1_000000000000_000000000000 | 11 |
ge20nn11enus_3901d4197baf_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 153.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog. | 10 |
ge20nn040000_200b94e8daef_000000000000_000000000000 | 9 |
ge20nr11enus_3901d4197baf_000000000000_000000000000 | 7 |
ge20nn040000_b293ea6c67e2_000000000000_000000000000 | 7 |
ge11nr030000_cd680697de12_000000000000_000000000000 | 6 |
ge20nn040000_89d3fd0d6813_000000000000_000000000000 | 6 |
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 |
ge20nn040000_4fc62b8ba0b7_000000000000_000000000000 | 6 |
HTTP/2 frames (Akamai)
| fingerprint | co-occurrences |
|---|---|
2:0;4:65535|67043329|0|m,s,a,p | 103 |
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. | 28 |
2:0;4:4194304;6:10485760|1073741824|0|m,a,s,p | 11 |
1:65536;2:0;4:131072;5:16384|12517377|3:0:0:42|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 152.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog. | 11 |
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. | 9 |
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, +8 more.The fingerprint page shows the full measured match list. More on the catalog. | 4 |
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. | 3 |
1:65536;2:0;4:131072;5:16384|12517377|11:0:0:42|m,p,a,s | 3 |
1:65536;2:0;4:131072;5:16384|12517377|9:0:0:22|m,p,a,s | 3 |
1:65536;2:0;4:131072;5:16384|12517377|13:0:0:42|m,p,a,s | 3 |
TCP SYN (p0f)
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
US · United States | 120 |
ID · Indonesia | 32 |
BR · Brazil | 21 |
RU · Russia | 12 |
TH · Thailand | 7 |
BD · Bangladesh | 5 |
AU · Australia | 5 |
BG · Bulgaria | 4 |
PK · Pakistan | 4 |
GB · United Kingdom | 4 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS8075 · Microsoft Corporation | 122 |
AS9657 · Melsa-i-net AS | 32 |
AS52875 · M.I.MONTREAL INFORMATICA LTDA | 11 |
AS28840 · PJSC TATTELECOM | 8 |
AS133481 · AIS Fibre | 5 |
AS25374 · ESCOM Ltd. - Haskovo | 4 |
AS29571 · Orange Côte d'Ivoire | 3 |
AS14593 · Space Exploration Technologies Corporation | 3 |
AS5607 · Sky UK Limited | 2 |
AS38195 · Superloop | 2 |
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 |
|---|---|
q13d0315h3_55b375c5d22e_dc5437974b47 | 4 |
q13d0311h3_55b375c5d22e_653d80c3fe9d | 3 |