TCP SYN (JA4T)
64240_2-1-3-1-1-4_1394_8
first seen 2026-08-22 04:36 · last seen 2026-08-24 06:14 · JSON
Distinct clients per day (last 30 days, peak 4/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 | 64240 |
|---|---|
| Option kinds | 2-1-3-1-1-4 |
| MSS | 1394 |
| 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 |
|---|---|
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, +24 more.The fingerprint page shows the full measured match list. More on the catalog. | 17 |
t13d1516h2_8daaf6152771_02713d6af862 Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 134.0.6998.35, chromium 133.0.6943.16.The fingerprint page shows the full measured match list. More on the catalog. | 3 |
t13d3113h1_e8f1e7e78f70_1b3407e2c936 | 2 |
HTTP request (JA4H)
HTTP/2 frames (Akamai)
| fingerprint | co-occurrences |
|---|---|
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 149.0.7827.102, +59 more.The fingerprint page shows the full measured match list. More on the catalog. | 10 |
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. | 6 |
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, +21 more.The fingerprint page shows the full measured match list. More on the catalog. | 2 |
1:65536;2:0;4:6291456;6:262144|15663105|7:1:0:220|m,a,s,p | 1 |
1:65536;2:0;4:6291456;6:262144|15663105|9:1:7:220|m,a,s,p | 1 |
TCP SYN (p0f)
| fingerprint | co-occurrences |
|---|---|
4:180+?:0:1394:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+:0 | 10 |
4:175+?:0:1394:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+:0 | 10 |
4:181+?:0:1394:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+:0 | 2 |
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
CN · China | 22 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS9808 · China Mobile Communications Group Co., Ltd. | 10 |
AS133776 · Quanzhou | 10 |
AS4837 · CHINA UNICOM China169 Backbone | 2 |
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_653d80c3fe9d | 12 |
q13d0311h3_55b375c5d22e_5a1f323ef56d | 2 |