TCP SYN (JA4T)
64800_2-4-8-1-3_1440_10
first seen 2026-06-29 23:14 · last seen 2026-09-16 01:09 · JSON
Last 7 days (99 observations)
Distinct clients per day (last 30 days, peak 14/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 | 424 |
t13d3112h1_1d947a95fc68_fa269c3d986d | 117 |
t12d290700_fc2078a0b8c0_8c06664c3ac5 | 19 |
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 |
t13d1617h2_86a278354501_3e9721a6796e | 5 |
t13d131100_f57a46bbacb6_e5728521abd4 | 5 |
t13d1517h2_8daaf6152771_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 154.0.1, firefox 155.0.1, +1 more.The fingerprint page shows the full measured match list. More on the catalog. | 4 |
t13d1713h1_ab0a1bf427ad_ecd0401ec68b Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1.The fingerprint page shows the full measured match list. More on the catalog. | 3 |
t13d1516h2_8daaf6152771_0c27189014cf Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 155.0.1, firefox 154.0.1.The fingerprint page shows the full measured match list. More on the catalog. | 3 |
t13d1515h2_8daaf6152771_a54fffd0eb61 | 2 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge11nn07cscz_62ad33df7c0a_000000000000_000000000000 | 329 |
ge11nn07cscz_d4021d63333c_000000000000_000000000000 | 71 |
ge11nn06cscz_fcadf6bdaa82_000000000000_000000000000 | 58 |
ge11nn06cscz_f604b96915d0_000000000000_000000000000 | 54 |
ge11nn06cscz_a9e98b5c162a_000000000000_000000000000 | 29 |
ge11nn05en00_61812dc1cc58_000000000000_000000000000 | 8 |
ge11nn040000_bfa5a9b89dd6_000000000000_000000000000 | 7 |
ge20nr12enus_54b4638ab28b_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 151.0.7922.137, edge 151.0.4129.93, +36 more.The fingerprint page shows the full measured match list. More on the catalog. | 6 |
ge11nr050000_3658ef221638_000000000000_000000000000 | 5 |
ge20nr11enus_187a9385d229_000000000000_000000000000 | 4 |
HTTP/2 frames (Akamai)
| fingerprint | co-occurrences |
|---|---|
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. | 10 |
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. | 5 |
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. | 5 |
1:4096;2:0;4:65535;5:16384;3:100;6:65536|16777216|0|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1.The fingerprint page shows the full measured match list. More on the catalog. | 2 |
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:256|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. | 2 |
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, +21 more.The fingerprint page shows the full measured match list. More on the catalog. | 2 |
1:65536;2:0;4:131072;5:16384|12517377|7:0:0:42|m,p,a,s | 1 |
1:65536;2:0;4:131072;5:16384|12517377|5:0:0:42|m,p,a,s | 1 |
1:65536;2:0;4:131072;5:16384|12517377|11:0:0:42|m,p,a,s | 1 |
1:65536;2:0;4:131072;5:16384|12517377|9:0:0:22|m,p,a,s | 1 |
TCP SYN (p0f)
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
CZ · Czechia | 541 |
FR · France | 21 |
US · United States | 13 |
NL · Netherlands | 13 |
CH · Switzerland | 5 |
DE · Germany | 3 |
BE · Belgium | 2 |
RU · Russia | 2 |
FI · Finland | 2 |
CA · Canada | 1 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS43037 · Seznam.cz, a.s. | 541 |
AS16276 · OVH SAS | 19 |
AS206238 · Freedom Internet BV | 13 |
AS7922 · Comcast Cable Communications, LLC | 10 |
AS29222 · Infomaniak Network SA | 5 |
AS24940 · Hetzner Online GmbH | 4 |
AS12322 · Free SAS | 2 |
AS6848 · Telenet BV | 2 |
AS51167 · Contabo GmbH | 1 |
AS16591 · Google Fiber Inc. | 1 |
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 | 5 |
q13d0311h3_55b375c5d22e_653d80c3fe9d | 4 |
q13d0314h3_55b375c5d22e_61e396c58b1f | 2 |
q13d0315h3_55b375c5d22e_78345df32b3a | 2 |