TCP SYN (JA4T)
64800_2-4-8-1-3_1440_7
first seen 2026-06-29 23:11 · last seen 2026-10-31 00:28 · JSON
Last 7 days (308 observations)
Distinct clients per day (last 30 days, peak 1041/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 | 64800 |
|---|---|
| Option kinds | 2-4-8-1-3 |
| MSS | 1440 |
| Window scale | 7 |
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 |
|---|---|
t13d301000_1d37bd780c83_3550537cd59b | 4920 |
t13d3013h2_1d37bd780c83_8537cf56674e | 908 |
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. | 681 |
t12d290700_fc2078a0b8c0_8c06664c3ac5 | 309 |
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. | 255 |
t13d1517h2_8daaf6152771_b1ff8ab2d16f | 227 |
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. | 123 |
t13d151000_8daaf6152771_18e8a06d9b2d | 86 |
t13d1715h2_5b57614c22b0_a54fffd0eb61 | 64 |
t13d1812h1_85036bcba153_d41ae481755e | 57 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge11nr08enus_002f1ef91713_000000000000_000000000000 | 4832 |
ge20nn030000_bf75ddd0bb29_000000000000_000000000000 | 895 |
ge20nr13enus_e2ac93ffb364_000000000000_000000000000 | 864 |
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, +36 more.The fingerprint page shows the full measured match list. More on the catalog. | 264 |
ge20nn020000_5594a17e7e7e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.13.0, +11 more.The fingerprint page shows the full measured match list. More on the catalog. | 168 |
ge11nn040000_bfa5a9b89dd6_000000000000_000000000000 | 147 |
ge11nn05en00_61812dc1cc58_000000000000_000000000000 | 123 |
ge11nr040000_e1d2031bdfea_000000000000_000000000000 | 99 |
ge11nr08enus_0b4981d9e830_000000000000_000000000000 | 88 |
ge20nn12enus_60f823d07c94_000000000000_000000000000 | 64 |
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. | 1180 |
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, +8 more.The fingerprint page shows the full measured match list. More on the catalog. | 909 |
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. | 131 |
1:65536;2:0;4:6291456;6:262144|15663105|1:0:0:256|m,a,s,p | 81 |
1:4096;2:0;4:65535;5:16384;3:100;6:65536|16777216|0|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1.The fingerprint page shows the full measured match list. More on the catalog. | 52 |
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. | 40 |
1:65536;3:1000;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p | 34 |
1:65536;2:0;4:131072;5:16384|12517377|1:0:0:42|m,p,a,s | 23 |
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. | 22 |
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. | 20 |
TCP SYN (p0f)
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
FR · France | 5290 |
US · United States | 1364 |
SE · Sweden | 329 |
SG · Singapore | 265 |
CN · China | 196 |
NL · Netherlands | 163 |
FI · Finland | 155 |
DE · Germany | 141 |
CA · Canada | 121 |
GB · United Kingdom | 71 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS51167 · Contabo GmbH | 4973 |
AS214483 · FiberPower LLC | 786 |
AS16276 · OVH SAS | 427 |
AS63949 · Akamai Connected Cloud | 392 |
AS214379 · South Park Networks LLC | 287 |
AS4134 · CHINANET BACKBONE | 169 |
AS24940 · Hetzner Online GmbH | 161 |
AS200651 · FlokiNET ehf | 78 |
AS62610 · Zenlayer Inc | 74 |
AS205016 · HERN Labs AB | 73 |
TLS supported groups
| fingerprint | co-occurrences |
|---|---|
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.22.1, python-httpx 0.28.1, python-requests 2.34.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog. | 896 |
0a0a,001d,0017,0018 | 860 |
001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: php-guzzle 8.3.1, curl 7.88.1, curl 8.13.0, +10 more.The fingerprint page shows the full measured match list. More on the catalog. | 33 |
001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13.The fingerprint page shows the full measured match list. More on the catalog. | 23 |
0a0a,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. | 22 |
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. | 20 |
001d,0017,001e,0019,0018 | 15 |
001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.12.28, rust-reqwest 0.11.27, powershell 7.6.8, +1 more.The fingerprint page shows the full measured match list. More on the catalog. | 7 |
11ec,001d,0017,0018,0019,0100,0101 | 6 |
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).