TCP SYN (JA4T)
65535_2-1-3-1-1-8-4-0-0_1220_6
first seen 2026-07-18 07:25 · last seen 2026-10-23 11:41 · JSON
Distinct clients per day (last 30 days, peak 2/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 | 1220 |
| 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. | 28 |
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. | 10 |
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. | 5 |
t13d181000_5d04281c6031_25d8bb11352d | 1 |
HTTP request (JA4H)
HTTP/2 frames (Akamai)
| fingerprint | co-occurrences |
|---|---|
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. | 4 |
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. | 4 |
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. | 4 |
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. | 4 |
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. | 2 |
1:65536;2:0;4:131072;5:16384|12517377|11:0:0:42|m,p,a,s | 2 |
1:65536;2:0;4:131072;5:16384|12517377|13:0:0:42|m,p,a,s | 2 |
1:65536;2:0;4:131072;5:16384|12517377|5:0:0:42|m,p,a,s | 2 |
1:65536;2:0;4:131072;5:16384|12517377|23:0:0:42|m,p,a,s | 2 |
2:0;4:2097152;3:100;9:1|10485760|0|m,s,p,a | 1 |
TCP SYN (p0f)
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
NO · Norway | 27 |
US · United States | 4 |
CN · China | 4 |
DE · Germany | 3 |
DK · Denmark | 2 |
NL · Netherlands | 1 |
CH · Switzerland | 1 |
EE · Estonia | 1 |
IT · Italy | 1 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS50304 · Blix Solutions AS | 27 |
AS4837 · CHINA UNICOM China169 Backbone | 4 |
AS60068 · Datacamp Limited | 4 |
AS39351 · 31173 Services AB | 2 |
AS44034 · Hi3G Access AB | 2 |
AS51852 · Private Layer INC | 1 |
AS43357 · Owl Limited | 1 |
AS2586 · Elisa Eesti AS | 1 |
AS3320 · Deutsche Telekom AG | 1 |
AS12874 · Fastweb SpA | 1 |
TLS supported groups
| fingerprint | co-occurrences |
|---|---|
11ec,001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 155.0.8059.40, chrome 156.0.8078.73, chromium 156.0.8078.47, +8 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
11ec,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 157.0.1, firefox-esr 153.5.1esr, firefox 158.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
0a0a,11ec,001d,0017,0018,0019 | 1 |
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 | 3 |
q13d0311h3_55b375c5d22e_f2a83c8e78ae | 1 |