TCP SYN (JA4T)
65535_2-1-3-1-1-8-4-0-0_1452_6
first seen 2026-07-01 14:37 · last seen 2026-09-16 18:36 · JSON
Last 7 days (9 observations)
Distinct clients per day (last 30 days, peak 3/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 | 1452 |
| 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 |
|---|---|
t13d3613h1_bcee18a5b459_89ab6efea773 | 56 |
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. | 50 |
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. | 29 |
t13d4907h2_0d8feac7bc37_7395dae3b2f3 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1.The fingerprint page shows the full measured match list. More on the catalog. | 21 |
t13d1517h2_8daaf6152771_cb7bf5808d99 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 152.0.7977.83, chrome 152.0.7977.64, chrome 152.0.7977.65, +5 more.The fingerprint page shows the full measured match list. More on the catalog. | 18 |
t13d2014h2_a09f3c656075_e42f34c56612 Match?Exact match in Thumbprint's published controlled catalog captures: safari 26.5.2, safari 26.5, urlsession 6.1.2, +1 more.The fingerprint page shows the full measured match list. More on the catalog. | 15 |
t13d1615h2_86a278354501_a54fffd0eb61 | 11 |
t13d1517h2_8daaf6152771_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 154.0.1, firefox 155.0.1, +1 more.The fingerprint page shows the full measured match list. More on the catalog. | 11 |
t13d2013h2_a09f3c656075_7f0f34a4126d Match?Exact match in Thumbprint's published controlled catalog captures: safari 26.5.2, safari 26.4, safari 26.6.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog. | 5 |
t13d1314h2_f57a46bbacb6_e42f34c56612 | 5 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge20nr12engb_54b4638ab28b_000000000000_000000000000 | 53 |
ge11nn06enus_21ea1759749c_000000000000_000000000000 | 42 |
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. | 23 |
ge11nn050000_be0d0b335e46_000000000000_000000000000 | 16 |
ge20nr13itit_016d87568c43_000000000000_000000000000 | 11 |
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. | 10 |
ge20nr08enus_0a5873f4dd2b_000000000000_000000000000 | 8 |
ge20nn13enus_0c2c1d640f3e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 151.0.7922.137, chrome 151.0.7922.170, chrome 151.0.7922.108, +23 more.The fingerprint page shows the full measured match list. More on the catalog. | 7 |
ge20nr13enus_5907f7c6644a_000000000000_000000000000 | 6 |
ge20nr07enus_0195bc40dc9f_000000000000_000000000000 | 6 |
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. | 64 |
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. | 21 |
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. | 17 |
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. | 11 |
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. | 8 |
2:0;4:2097152;3:100|10485760|0|m,s,p,a | 8 |
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. | 5 |
2:0;4:2097152;3:100|10485760|1:0:0:255|m,s,p,a | 5 |
1:65536;2:0;4:131072;5:16384|12517377|11:0:0:42|m,p,a,s | 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 26.5, safari 26.4, +2 more.The fingerprint page shows the full measured match list. More on the catalog. | 4 |
TCP SYN (p0f)
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
ES · Spain | 63 |
TR · Turkey | 57 |
MA · Morocco | 39 |
IN · India | 20 |
IT · Italy | 13 |
AR · Argentina | 11 |
NL · Netherlands | 9 |
CN · China | 7 |
US · United States | 5 |
CA · Canada | 4 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS3352 · TELEFONICA DE ESPANA S.A.U. | 59 |
AS9121 · Turk Telekomunikasyon Anonim Sirketi | 57 |
AS36903 · Office National des Postes et Telecommunications ONPT (Maroc Telecom) / IAM | 37 |
AS24309 · Atria Convergence Technologies Pvt. Ltd. Broadband Internet Service Provider INDIA | 19 |
AS1267 · WIND TRE S.P.A. | 13 |
AS22927 · Telefonica de Argentina | 11 |
AS209 · CenturyLink Communications, LLC | 5 |
AS1136 · KPN B.V. | 5 |
AS577 · Bell Canada | 4 |
AS3462 · Data Communication Business Group | 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 | 54 |
q13d0312h3_55b375c5d22e_178839b6cec1 | 14 |
q13d0315h3_55b375c5d22e_dc5437974b47 | 4 |
q13d0311h3_55b375c5d22e_f2a83c8e78ae | 3 |