TCP SYN (JA4T)
64680_2-1-3-1-1-4_1320_8
first seen 2026-09-03 15:58 · last seen 2026-09-03 16:05 · JSON
Distinct clients per day (last 30 days, peak 1/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 | 64680 |
|---|---|
| Option kinds | 2-1-3-1-1-4 |
| MSS | 1320 |
| Window scale | 8 |
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 |
|---|---|
t13d2013h1_2b729b4bf6f3_e24568c0d440 | 1 |
t13d1616h2_86a278354501_0c27189014cf Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 152.0.6, +10 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
t13d2712h2_b4f9224df7c1_cbb9361b6bf9 | 1 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge11nn030000_fe444ad14866_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.16.0.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
ge20nr11enus_1d88e8a431b9_000000000000_000000000000 | 1 |
ge20nn010000_379fadc6c8b7_000000000000_000000000000 | 1 |
HTTP/2 frames (Akamai)
| fingerprint | co-occurrences |
|---|---|
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 154.0, +25 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
1:65536;2:0;4:6291456;6:262144;4:1048576|15663105|1:0:0:256|m,a,s,p | 1 |
TCP SYN (p0f)
| fingerprint | co-occurrences |
|---|---|
6:120+8:0:1320:mss*49,8:mss,nop,ws,nop,nop,sok:flow:0 | 2 |
6:106+22:0:1320:mss*49,8:mss,nop,ws,nop,nop,sok:flow:0 | 1 |
User-Agent
| fingerprint | co-occurrences |
|---|---|
curl/8.13.0 | 1 |
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:153.0) Gecko/20100101 Firefox/153.0 | 1 |
Country
| fingerprint | co-occurrences |
|---|---|
SE · Sweden | 3 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS212238 · Datacamp Limited | 3 |
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 |
|---|---|
q13d0315h3_55b375c5d22e_dc5437974b47 | 1 |