TCP SYN (JA4T)
65535_2-1-3-4-8_1452_8
first seen 2026-07-18 08:25 · last seen 2026-08-31 06:56 · JSON
Distinct clients per day (last 30 days, peak 4/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 | 2-1-3-4-8 |
| MSS | 1452 |
| 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 |
|---|---|
t13d2013h1_2b729b4bf6f3_e24568c0d440 | 11 |
t13d181100_85036bcba153_d41ae481755e | 10 |
t13d2913h1_723694b0fccc_5671b5df5029 | 9 |
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. | 5 |
t13d1617h2_86a278354501_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 152.0.3, +10 more.The fingerprint page shows the full measured match list. More on the catalog. | 5 |
t12d1515h2_8daaf6152771_4d8a99c1bc01 | 1 |
t13d171000_5b57614c22b0_78e6aca7449b | 1 |
t13d201100_2b729b4bf6f3_36bf25f296df | 1 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
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. | 11 |
ge11nn040000_08e7224bf8c7_000000000000_000000000000 | 9 |
ge11nr11ruru_835281d8e5d9_000000000000_000000000000 | 5 |
ge20nr13ruru_9e2b86631664_000000000000_000000000000 | 4 |
ge20nr16ruru_94fdc06e0694_000000000000_000000000000 | 4 |
ge20nr16thth_94fdc06e0694_000000000000_000000000000 | 1 |
ge20nr09zhcn_4886f2cdeb15_000000000000_000000000000 | 1 |
ge11nn050000_2469c960a647_000000000000_000000000000 | 1 |
ge11nn030000_b0d6a43aa599_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: powershell 5.1.26100.33296, powershell 5.1.26100.33158, powershell 5.1.26100.32995.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
ge11nn030000_69803879d94f_000000000000_000000000000 | 1 |
HTTP/2 frames (Akamai)
| fingerprint | co-occurrences |
|---|---|
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 |
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. | 5 |
1:65536;3:1000;4:6291456;5:16384;6:262144|15663105|0|m,a,s,p | 1 |
TCP SYN (p0f)
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
VN · Vietnam | 23 |
RU · Russia | 16 |
BE · Belgium | 2 |
TH · Thailand | 1 |
CN · China | 1 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS12389 · PJSC Rostelecom | 16 |
AS7552 · Viettel Group | 10 |
AS18403 · FPT Telecom Company | 8 |
AS45899 · VNPT Corp | 5 |
AS5432 · Proximus NV | 2 |
AS4134 · CHINANET BACKBONE | 1 |
AS133481 · AIS Fibre | 1 |