TCP SYN (JA4T)
65535_2-4-8-1-3_1390_12
first seen 2026-06-30 01:35 · last seen 2026-09-15 21:44 · JSON
Last 7 days (193 observations)
Distinct clients per day (last 30 days, peak 16/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 | 65535 |
|---|---|
| Option kinds | 2-4-8-1-3 |
| MSS | 1390 |
| Window scale | 12 |
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 |
|---|---|
t13d1011h2_61a7ad8aa9b6_3fcd1a44f3e3 Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.12.28.The fingerprint page shows the full measured match list. More on the catalog. | 851 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge20nr050000_a36a3d5685e0_000000000000_000000000000 | 513 |
ge20nn050000_a36a3d5685e0_000000000000_000000000000 | 338 |
HTTP/2 frames (Akamai)
| fingerprint | co-occurrences |
|---|---|
2:0;4:2097152;5:16384;6:16384|5177345|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.13.4, rust-reqwest 0.12.28, rust-hyper 1.11.0, +3 more.The fingerprint page shows the full measured match list. More on the catalog. | 851 |
TCP SYN (p0f)
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
US · United States | 851 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS8075 · Microsoft Corporation | 851 |