TCP SYN (JA4T)
65535_2-1-1-4-1-3_1460_5
first seen 2026-08-07 12:19 · last seen 2026-10-06 13:14 · 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 | 65535 |
|---|---|
| Option kinds | 2-1-1-4-1-3 |
| MSS | 1460 |
| Window scale | 5 |
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_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. | 7 |
t13d2013h2_a09f3c656075_7f0f34a4126d Match?Exact match in Thumbprint's published controlled catalog captures: safari 26.5.2, safari 26.6.2, safari 26.4, +2 more.The fingerprint page shows the full measured match list. More on the catalog. | 3 |
HTTP request (JA4H)
HTTP/2 frames (Akamai)
| fingerprint | co-occurrences |
|---|---|
2:0;3:100;4:2097152;9:1|10420225|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: safari 26.5.2, safari 26.6.2, safari 26.5, +2 more.The fingerprint page shows the full measured match list. More on the catalog. | 3 |
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|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. | 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|3:1:0:256|m,a,s,p | 1 |
1:65536;2:0;4:6291456;6:262144|15663105|7:1:0:256|m,a,s,p | 1 |
1:65536;2:0;4:6291456;6:262144|15663105|5:1:0:256|m,a,s,p | 1 |
1:65536;2:0;4:6291456;6:262144|15663105|9:1:0:256|m,a,s,p | 1 |
TCP SYN (p0f)
| fingerprint | co-occurrences |
|---|---|
4:48+16:0:1460:65535,5:mss,nop,nop,sok,nop,ws:df,id+:0 | 7 |
4:49+15:0:1460:65535,5:mss,nop,nop,sok,nop,ws:df,id+:0 | 2 |
4:50+14:0:1460:65535,5:mss,nop,nop,sok,nop,ws:df,id+:0 | 1 |
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
US · United States | 10 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS20001 · Charter Communications Inc | 7 |
AS7922 · Comcast Cable Communications, LLC | 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 |
|---|---|
q13d0311h3_55b375c5d22e_f2a83c8e78ae | 2 |
q13d0311h3_55b375c5d22e_653d80c3fe9d | 1 |