TCP SYN (JA4T)
65535_2-1-3-1-1-8-4-0-0_1340_6
first seen 2026-07-26 21:38 · last seen 2026-10-05 20:02 · 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 | 2-1-3-1-1-8-4-0-0 |
| MSS | 1340 |
| Window scale | 6 |
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 |
|---|---|
t13d1517h2_8daaf6152771_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 155.0.1, firefox 154.0, firefox 156.0, +7 more.The fingerprint page shows the full measured match list. More on the catalog. | 24 |
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. | 2 |
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. | 2 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge20nr11enus_3901d4197baf_000000000000_000000000000 | 20 |
ge20nr10enus_b3034183f430_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 155.0.1, +27 more.The fingerprint page shows the full measured match list. More on the catalog. | 4 |
ge20nn030000_ff50983941c1_000000000000_000000000000 | 3 |
ge20nr12enus_54b4638ab28b_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 152.0.7977.83, chrome 151.0.7922.137, +58 more.The fingerprint page shows the full measured match list. More on the catalog. | 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 155.0.1, +31 more.The fingerprint page shows the full measured match list. More on the catalog. | 2 |
3:100;4:2097152|00|0|m,s,p,a | 2 |
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. | 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;4:131072;5:16384|12517377|5:0:0:22|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0.3, firefox 154.0, firefox 153.0, +12 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
1:65536;2:0;4:131072;5:16384|12517377|7:0:0:22|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0.3, firefox 155.0, firefox 154.0, +3 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
1:65536;2:0;4:131072;5:16384|12517377|17:0:0:42|m,p,a,s | 1 |
1:65536;2:0;4:131072;5:16384|12517377|13:0:0:42|m,p,a,s | 1 |
1:65536;2:0;4:131072;5:16384|12517377|15:0:0:42|m,p,a,s | 1 |
1:65536;2:0;4:131072;5:16384|12517377|19:0:0:42|m,p,a,s | 1 |
TCP SYN (p0f)
| fingerprint | co-occurrences |
|---|---|
4:48+16:0:1340:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,ecn:0 | 24 |
4:45+19:0:1340:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df:0 | 4 |
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
DE · Germany | 24 |
IT · Italy | 4 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS43357 · Owl Limited | 24 |
AS1267 · WIND TRE S.P.A. | 4 |
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 | 1 |