TCP SYN (p0f)
4:46+18:0:1460:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+:0
first seen 2026-08-21 17:00 · last seen 2026-09-02 19:46 · JSON
Distinct clients per day (last 30 days, peak 2/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 | 46+18 |
| Options length | 0 |
| MSS | 1460 |
| Window size | mss*44 |
| Window scale | 8 |
| Options layout | mss,nop,ws,nop,nop,sok |
| 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 |
|---|---|
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. | 5 |
t13d2913h1_723694b0fccc_5671b5df5029 | 2 |
t13d1617h2_86a278354501_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 152.0.3, +10 more.The fingerprint page shows the full measured match list. More on the catalog. | 2 |
t13d1515h1_8daaf6152771_de4a06bb82e3 | 1 |
t13d1515h1_8daaf6152771_0a20fe35d3a5 | 1 |
HTTP request (JA4H)
HTTP/2 frames (Akamai)
| fingerprint | co-occurrences |
|---|---|
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. | 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. | 2 |
TCP SYN (JA4T)
| fingerprint | co-occurrences |
|---|---|
64240_2-1-3-1-1-4_1460_8 | 11 |
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
BG · Bulgaria | 6 |
UA · Ukraine | 2 |
SE · Sweden | 1 |
FR · France | 1 |
IT · Italy | 1 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS8866 · Vivacom Bulgaria EAD | 6 |
AS8473 · Bahnhof AB | 1 |
AS3215 · Orange S.A. | 1 |
AS35362 · Best ISP | 1 |
AS25229 · Limited Liability Company KYIVSKI TELEKOMUNIKATSIYNI MEREZHI | 1 |
AS198471 · Opnet Srl | 1 |