TCP SYN (JA4T)
64800_2-4-8-1-3_1440_10
first seen 2026-06-29 23:14 · last seen 2026-11-01 11:43 · JSON
Last 7 days (139 observations)
Distinct clients per day (last 30 days, peak 89/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 | 64800 |
|---|---|
| Option kinds | 2-4-8-1-3 |
| MSS | 1440 |
| Window scale | 10 |
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 |
|---|---|
t13d3112h1_1d947a95fc68_b72e173852fa Match?Exact match in Thumbprint's published controlled catalog captures: java-urlconnection 11.0.31.The fingerprint page shows the full measured match list. More on the catalog. | 769 |
t12d290700_fc2078a0b8c0_8c06664c3ac5 | 200 |
t13d251100_b78ed14e2fd0_f50d94e863eb | 153 |
t13d3112h1_1d947a95fc68_fa269c3d986d | 117 |
t13d3013h2_1d37bd780c83_8537cf56674e Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.18.0.The fingerprint page shows the full measured match list. More on the catalog. | 84 |
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. | 82 |
t13d3515h1_8f004308c246_5c2c66f702b0 | 57 |
t13d3113h1_1d947a95fc68_7e1102d2036b | 47 |
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, +28 more.The fingerprint page shows the full measured match list. More on the catalog. | 42 |
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. | 38 |
HTTP request (JA4H)
HTTP/2 frames (Akamai)
| fingerprint | co-occurrences |
|---|---|
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, +8 more.The fingerprint page shows the full measured match list. More on the catalog. | 84 |
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 152.0.7977.83, +85 more.The fingerprint page shows the full measured match list. More on the catalog. | 48 |
1:65536;2:0;4:6291456;6:262144|15663105|3:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 151.0.7922.34, chromium 147.0.7727.15, chromium 145.0.7632.6, +26 more.The fingerprint page shows the full measured match list. More on the catalog. | 28 |
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, +60 more.The fingerprint page shows the full measured match list. More on the catalog. | 25 |
1:65536;2:0;4:6291456;6:262144|15663105|5:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 133.0.6943.16, chrome 156.0.8078.48, chrome 150.0.7871.128, +3 more.The fingerprint page shows the full measured match list. More on the catalog. | 25 |
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 155.0.1, +32 more.The fingerprint page shows the full measured match list. More on the catalog. | 21 |
1:65536;2:0;4:6291456;6:262144|15663105|7:1:0:220|m,a,s,p | 14 |
1:65536;2:0;4:6291456;6:262144|15663105|9:1:0:220|m,a,s,p | 14 |
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. | 10 |
4:16777216|16711681|0|m,p,a,s | 9 |
TCP SYN (p0f)
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
CZ · Czechia | 934 |
US · United States | 237 |
FR · France | 221 |
CH · Switzerland | 169 |
DE · Germany | 65 |
HU · Hungary | 30 |
BE · Belgium | 25 |
SI · Slovenia | 25 |
NL · Netherlands | 22 |
CA · Canada | 14 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS43037 · Seznam.cz, a.s. | 933 |
AS16276 · OVH SAS | 210 |
AS264617 · GRUPO PANAGLOBAL 15 S.A | 153 |
AS132892 · Cloudflare, Inc. | 138 |
AS202623 · Cloudflare Inc | 59 |
AS25369 · Hydra Communications Ltd | 57 |
AS211619 · MAXKO d.o.o. | 30 |
AS34779 · T-2, d.o.o. | 24 |
AS6696 · VERIXI SA | 22 |
AS16591 · Google Fiber Inc. | 18 |
TLS supported groups
| fingerprint | co-occurrences |
|---|---|
001d,0017,0018,0019,001e,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: java-httpclient 17.0.19, java-httpclient 11.0.31, java-urlconnection 17.0.19, +2 more.The fingerprint page shows the full measured match list. More on the catalog. | 136 |
11ec,11eb,11ed,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.27.3, go-net/http 1.26.10.The fingerprint page shows the full measured match list. More on the catalog. | 129 |
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1, python-requests 2.34.2, curl 8.23.0, +4 more.The fingerprint page shows the full measured match list. More on the catalog. | 81 |
001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.12.28, rust-reqwest 0.11.27, winhttp 10.0.20348.1, +2 more.The fingerprint page shows the full measured match list. More on the catalog. | 31 |
001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, php-guzzle 8.3.1, curl 7.88.1, +10 more.The fingerprint page shows the full measured match list. More on the catalog. | 7 |
0a0a,11ec,001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 156.0.8078.48, edge 155.0.4283.62, chrome 156.0.8078.47, +11 more.The fingerprint page shows the full measured match list. More on the catalog. | 7 |
001d,0017,0018,0019,0100,0101 | 6 |
11ec,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 158.0.1, firefox 157.0, firefox 157.0.1, +5 more.The fingerprint page shows the full measured match list. More on the catalog. | 3 |
11ec,001d,0017,0018,0019,0100,0101 | 2 |
0a0a,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: urlsession 6.1.2, safari 27.2.The fingerprint page shows the full measured match list. More on the catalog. | 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).