TCP SYN (p0f)
4:51+13:0:1460:mss*44,14:mss,sok,ts,nop,ws:df,id+:0
first seen 2026-08-07 03:56 · last seen 2026-10-23 22:42 · JSON
Distinct clients per day (last 30 days, peak 21/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 | 4 |
|---|---|
| Initial TTL | 51+13 |
| Options length | 0 |
| MSS | 1460 |
| Window size | mss*44 |
| Window scale | 14 |
| Options layout | mss,sok,ts,nop,ws |
| Quirks | df,id+ |
| 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 |
|---|---|
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. | 21 |
t12d210700_76e208dd3e22_2dae41c691ec | 2 |
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. | 1 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge20nn030000_bf75ddd0bb29_000000000000_000000000000 | 21 |
ge11nn12enus_d9dcce99a5ac_000000000000_000000000000 | 2 |
ge20nn13zhcn_0c2c1d640f3e_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. | 21 |
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. | 1 |
TCP SYN (JA4T)
| fingerprint | co-occurrences |
|---|---|
64240_2-4-8-1-3_1460_14 | 24 |
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
JP · Japan | 4 |
AR · Argentina | 4 |
CA · Canada | 3 |
PA · Panama | 3 |
SG · Singapore | 2 |
RU · Russia | 2 |
KG · Kyrgyzstan | 2 |
US · United States | 1 |
GB · United Kingdom | 1 |
BE · Belgium | 1 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS396356 · Latitude.sh | 4 |
AS136557 · Host Universal Pty Ltd | 4 |
AS27956 · Cyber Cast International, S.A. | 3 |
AS212667 · RECONN LLC | 2 |
AS39819 · Optima Telecom Ltd. | 2 |
AS36666 · GloboTech Communications | 2 |
AS59211 · OneAsiaHost | 2 |
AS62240 · Clouvider | 1 |
AS31898 · Oracle Corporation | 1 |
AS63023 · GTHost | 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: 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. | 21 |