TCP SYN (JA4T)
65535_2-4-8-1-3_1460_8
first seen 2026-07-01 15:07 · last seen 2026-09-15 06:43 · JSON
Last 7 days (237 observations)
Distinct clients per day (last 30 days, peak 252/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 | 2-4-8-1-3 |
| MSS | 1460 |
| 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 |
|---|---|
t13d1515h1_8daaf6152771_de4a06bb82e3 | 590 |
t13d1515h1_8daaf6152771_0a20fe35d3a5 | 496 |
t13d4412h1_fd39b124ee10_58ed7828516f | 434 |
t13d3112h2_e8f1e7e78f70_b26ce05bbdd6 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.5.0, php-curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog. | 169 |
t13d2013h1_2b729b4bf6f3_e24568c0d440 | 58 |
t13d1516h1_8daaf6152771_1a63afa7c478 | 55 |
t13d1516h2_8daaf6152771_d8a2da3f94cd Match?Exact match in Thumbprint's published controlled catalog captures: chromium 149.0.7827.102, chrome 149.0.7827.102, chrome 149.0.7827.156, +25 more.The fingerprint page shows the full measured match list. More on the catalog. | 45 |
t13d3013h2_1d37bd780c83_8537cf56674e | 33 |
t13d151000_dad3e448d43e_78e6aca7449b | 10 |
t13d1616h2_86a278354501_eeeea6562960 | 9 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge11nn13enus_9db22d02e17a_000000000000_000000000000 | 817 |
ge11nn050000_b223a0ebb0b5_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.34.2, python-requests 2.33.1, python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog. | 435 |
ge11nn14enus_4a2973d235de_000000000000_000000000000 | 324 |
ge20nn020000_5594a17e7e7e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.18.0, +9 more.The fingerprint page shows the full measured match list. More on the catalog. | 202 |
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. | 58 |
ge20nr12enus_54b4638ab28b_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 151.0.7922.137, edge 151.0.4129.93, +36 more.The fingerprint page shows the full measured match list. More on the catalog. | 21 |
ge20nr13enus_e2ac93ffb364_000000000000_000000000000 | 9 |
ge20nr13enus_0c2c1d640f3e_000000000000_000000000000 | 8 |
ge11nn080000_916d4997cb05_000000000000_000000000000 | 7 |
ge11nn100000_85b7ab1bffb1_000000000000_000000000000 | 7 |
HTTP/2 frames (Akamai)
| fingerprint | co-occurrences |
|---|---|
3:100;4:10485760;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0.The fingerprint page shows the full measured match list. More on the catalog. | 169 |
3:100;4:65536;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, curl 8.18.0, curl 8.21.0, +7 more.The fingerprint page shows the full measured match list. More on the catalog. | 33 |
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. | 24 |
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. | 21 |
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. | 7 |
4:16777216|16711681|0|m,p,a,s | 6 |
1:4096;2:0;4:32768;5:16384|12517377|3:0:0:22|m,p,a,s | 5 |
1:65536;2:0;4:6291456;6:262144|15663105|5:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 133.0.6943.16, chrome 150.0.7871.128, chromium 148.0.7778.96, +2 more.The fingerprint page shows the full measured match list. More on the catalog. | 4 |
1:65536;3:1000;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p | 3 |
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. | 2 |
TCP SYN (p0f)
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
US · United States | 965 |
MX · Mexico | 142 |
CA · Canada | 71 |
GB · United Kingdom | 64 |
UA · Ukraine | 56 |
RU · Russia | 54 |
BR · Brazil | 48 |
CO · Colombia | 41 |
VE · Venezuela | 41 |
ZA · South Africa | 28 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS7922 · Comcast Cable Communications, LLC | 287 |
AS701 · Verizon Business | 95 |
AS7018 · AT&T Enterprises, LLC | 95 |
AS14593 · Space Exploration Technologies Corporation | 74 |
AS5650 · Verizon Business | 57 |
AS13999 · Mega Cable, S.A. de C.V. | 50 |
AS22773 · Cox Communications Inc. | 45 |
AS20115 · Charter Communications LLC | 37 |
AS5089 · Virgin Media Limited | 31 |
AS6128 · Cablevision Systems Corp. | 31 |
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 | 11 |
q13d0315h3_55b375c5d22e_dc5437974b47 | 3 |