TCP SYN (JA4T)
64240_2-1-3-1-1-4_1452_8
first seen 2026-07-06 11:02 · last seen 2026-09-15 09:20 · JSON
Last 7 days (12 observations)
Distinct clients per day (last 30 days, peak 41/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 | 1452 |
| 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 |
|---|---|
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. | 158 |
t13d2913h1_723694b0fccc_5671b5df5029 | 120 |
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. | 24 |
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 |
t13d1515h1_8daaf6152771_de4a06bb82e3 | 9 |
t13d1515h1_8daaf6152771_0a20fe35d3a5 | 7 |
t12d190800_d83cc789557e_7af1ed941c26 | 7 |
t13d3013h2_1d37bd780c83_8537cf56674e | 5 |
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. | 3 |
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. | 3 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge20nr16heil_94fdc06e0694_000000000000_000000000000 | 27 |
ge20nr16eses_94fdc06e0694_000000000000_000000000000 | 23 |
ge11nr11heil_835281d8e5d9_000000000000_000000000000 | 15 |
ge20nr16thth_94fdc06e0694_000000000000_000000000000 | 14 |
ge11nn13enus_9db22d02e17a_000000000000_000000000000 | 12 |
ge20nr16dede_94fdc06e0694_000000000000_000000000000 | 11 |
ge20nn16heil_94fdc06e0694_000000000000_000000000000 | 10 |
ge20nr16itit_94fdc06e0694_000000000000_000000000000 | 10 |
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 |
ge11nr11eses_835281d8e5d9_000000000000_000000000000 | 9 |
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. | 172 |
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. | 24 |
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. | 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. | 3 |
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. | 3 |
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. | 1 |
2:0;3:100;4:2097152;9:1|10420225|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: safari 26.5.2, safari 26.5, safari 26.4, +2 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
TCP SYN (p0f)
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
IL · Israel | 58 |
ES · Spain | 46 |
IT · Italy | 37 |
DE · Germany | 29 |
TH · Thailand | 29 |
BE · Belgium | 28 |
BG · Bulgaria | 16 |
BR · Brazil | 10 |
VN · Vietnam | 10 |
CH · Switzerland | 9 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS6810 · "Bezeq"- THE ISRAEL TELECOMMUNICATION CORP. LTD. | 39 |
AS23969 · TOT Public Company Limited | 26 |
AS5432 · Proximus NV | 26 |
AS3352 · TELEFONICA DE ESPANA S.A.U. | 22 |
AS3320 · Deutsche Telekom AG | 22 |
AS3269 · Telecom Italia S.p.A. | 21 |
AS1680 · Cellcom Fixed Line Communication L.P | 14 |
AS57269 · DIGI SPAIN TELECOM S.A | 14 |
AS8866 · Vivacom Bulgaria EAD | 13 |
AS30722 · Fastweb SpA | 9 |
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 |
q13d0314h3_55b375c5d22e_61e396c58b1f | 1 |
q13d0312h3_55b375c5d22e_178839b6cec1 | 1 |