TCP SYN (p0f)
6:45+19:0:1440:mss*45,10:mss,sok,ts,nop,ws:flow:0
first seen 2026-08-06 19:14 · last seen 2026-11-01 20:28 · JSON
Last 7 days (20 observations)
Distinct clients per day (last 30 days, peak 28/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
| IP version | 6 |
|---|---|
| Initial TTL | 45+19 |
| Options length | 0 |
| MSS | 1440 |
| Window size | mss*45 |
| Window scale | 10 |
| Options layout | mss,sok,ts,nop,ws |
| Quirks | flow |
| Payload class | 0 |
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. | 62 |
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. | 25 |
t13d3113h1_1d947a95fc68_7e1102d2036b | 16 |
t13d1715h2_5b57614c22b0_a54fffd0eb61 | 13 |
t13d1517h2_8daaf6152771_cb7bf5808d99 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 152.0.7977.83, chrome 156.0.8078.48, chrome 154.0.8037.57, +27 more.The fingerprint page shows the full measured match list. More on the catalog. | 4 |
t13d1714h2_5b57614c22b0_53a6d0ab1c42 | 3 |
t13d1516h2_8daaf6152771_0c27189014cf Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 155.0.1, firefox 155.0, +6 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge11nn07cscz_62ad33df7c0a_000000000000_000000000000 | 58 |
ge20nn030000_bf75ddd0bb29_000000000000_000000000000 | 24 |
ge11nn06cscz_f604b96915d0_000000000000_000000000000 | 11 |
ge20nn12enus_a72b71f519fc_000000000000_000000000000 | 10 |
ge11nn07cscz_d4021d63333c_000000000000_000000000000 | 5 |
ge11nn06cscz_fcadf6bdaa82_000000000000_000000000000 | 4 |
ge20nr11enus_187a9385d229_000000000000_000000000000 | 2 |
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, +39 more.The fingerprint page shows the full measured match list. More on the catalog. | 2 |
ge20nr13enus_44e1f6d71293_000000000000_000000000000 | 2 |
ge20nr14enus_4600588ae5ca_000000000000_000000000000 | 2 |
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. | 25 |
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 |
1:65536;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. | 4 |
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. | 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 152.0.7977.83, +85 more.The fingerprint page shows the full measured match list. More on the catalog. | 2 |
1:65536;2:0;4:131072;5:16384|12517377|9:0:0:42|m,p,a,s | 1 |
1:65536;2:0;4:131072;5:16384|12517377|17:0:0:42|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|13:0:0:42|m,p,a,s | 1 |
1:65536;2:0;4:131072;5:16384|12517377|15:0:0:42|m,p,a,s | 1 |
TCP SYN (JA4T)
| fingerprint | co-occurrences |
|---|---|
64800_2-4-8-1-3_1440_10 | 124 |
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
CZ · Czechia | 78 |
SI · Slovenia | 22 |
HU · Hungary | 18 |
FR · France | 6 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS43037 · Seznam.cz, a.s. | 78 |
AS34779 · T-2, d.o.o. | 22 |
AS211619 · MAXKO d.o.o. | 18 |
AS51167 · Contabo GmbH | 6 |
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. | 35 |
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. | 24 |
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. | 1 |
001d,0017,0018,0019,0100,0101 | 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 |
|---|---|
q13d0313h3_55b375c5d22e_fc7519ff7bc2 | 3 |
q13d0312h3_55b375c5d22e_178839b6cec1 | 2 |
q13d0315h3_55b375c5d22e_dc5437974b47 | 1 |