TCP SYN (p0f)
6:47+17:0:1440:mss*45,10:mss,sok,ts,nop,ws:flow:0
first seen 2026-06-27 07:27 · last seen 2026-10-29 23:35 · JSON
Last 7 days (4 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
| IP version | 6 |
|---|---|
| Initial TTL | 47+17 |
| 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. | 38 |
t13d3013h2_1d37bd780c83_8537cf56674e | 13 |
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. | 6 |
t13d1517h2_8daaf6152771_cb7bf5808d99 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 152.0.7977.83, chrome 154.0.8037.57, chrome 152.0.7977.64, +24 more.The fingerprint page shows the full measured match list. More on the catalog. | 2 |
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. | 1 |
t13d4312h1_c7886603b240_b26ce05bbdd6 | 1 |
t13d3012h2_1d37bd780c83_882d495ac381 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.21.0, curl 8.22.0, curl 8.23.0, +7 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
t13d1712h1_ab0a1bf427ad_882d495ac381 | 1 |
t13d301200_1d37bd780c83_ecd0401ec68b | 1 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge11nn07cscz_62ad33df7c0a_000000000000_000000000000 | 34 |
ge20nn030000_bf75ddd0bb29_000000000000_000000000000 | 13 |
ge20nr12en00_54b4638ab28b_000000000000_000000000000 | 5 |
ge11nn06cscz_f604b96915d0_000000000000_000000000000 | 3 |
ge20nr14enus_4600588ae5ca_000000000000_000000000000 | 2 |
ge20nn030000_042112399351_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
ge11nn050000_b223a0ebb0b5_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.34.2, python-requests 2.33.1, python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
ge11nr040000_8391bea91fb6_000000000000_000000000000 | 1 |
ge11nn040000_5b1e8b5f4d2d_000000000000_000000000000 | 1 |
ge11nn030000_1b6b7c27a67b_000000000000_000000000000 | 1 |
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. | 14 |
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, +81 more.The fingerprint page shows the full measured match list. More on the catalog. | 5 |
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:256|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, +57 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
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. | 1 |
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. | 1 |
TCP SYN (JA4T)
| fingerprint | co-occurrences |
|---|---|
64800_2-4-8-1-3_1440_10 | 63 |
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
CZ · Czechia | 39 |
HU · Hungary | 12 |
US · United States | 5 |
SI · Slovenia | 2 |
DE · Germany | 1 |
NL · Netherlands | 1 |
CH · Switzerland | 1 |
FR · France | 1 |
RU · Russia | 1 |
CN · China | 1 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS43037 · Seznam.cz, a.s. | 38 |
AS211619 · MAXKO d.o.o. | 12 |
AS9009 · M247 Europe SRL | 5 |
AS34779 · T-2, d.o.o. | 2 |
AS212238 · Datacamp Limited | 1 |
AS51167 · Contabo GmbH | 1 |
AS51396 · Pfcloud UG | 1 |
AS13030 · Init7 (Switzerland) Ltd. | 1 |
AS12322 · Free SAS | 1 |
AS7497 · Computer Network Information Center of Chinese Academy of Sciences (CNIC-CAS) | 1 |
TLS supported groups
| fingerprint | co-occurrences |
|---|---|
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.22.1, python-httpx 0.28.1, python-requests 2.34.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog. | 13 |
0a0a,11ec,001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 155.0.8059.40, chrome 156.0.8078.73, chromium 156.0.8078.47, +8 more.The fingerprint page shows the full measured match list. More on the catalog. | 2 |
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. | 1 |
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. | 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 |
|---|---|
q13d0312h3_55b375c5d22e_178839b6cec1 | 2 |
q13d0311h3_55b375c5d22e_653d80c3fe9d | 1 |