TCP SYN (JA4T)
65535_2-1-1-4_1460_00
first seen 2026-07-16 19:51 · last seen 2026-10-23 22:40 · JSON
Distinct clients per day (last 30 days, peak 1/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 | 2-1-1-4 |
| MSS | 1460 |
| Window scale | 00 |
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 |
|---|---|
t13d1712h2_6fb0c1f7f59f_b2c23852c975 | 5 |
t13d2913h1_723694b0fccc_5671b5df5029 | 4 |
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. | 3 |
t13d4312h1_c7886603b240_b26ce05bbdd6 | 1 |
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. | 1 |
t13d3013h2_1d37bd780c83_8537cf56674e Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.18.0.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge20nr10enus_327edc7bd759_000000000000_000000000000 | 4 |
ge20nr16svse_94fdc06e0694_000000000000_000000000000 | 2 |
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. | 1 |
ge20nn030000_bf75ddd0bb29_000000000000_000000000000 | 1 |
ge20nr11enus_bd1a02c579a6_000000000000_000000000000 | 1 |
ge11nr11enus_835281d8e5d9_000000000000_000000000000 | 1 |
ge20nn16lvlv_94fdc06e0694_000000000000_000000000000 | 1 |
ge11nr11svse_b350a6a7c155_000000000000_000000000000 | 1 |
ge11nr11heil_835281d8e5d9_000000000000_000000000000 | 1 |
ge20nn13frbe_9e2b86631664_000000000000_000000000000 | 1 |
HTTP/2 frames (Akamai)
TCP SYN (p0f)
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
DE · Germany | 5 |
SE · Sweden | 3 |
IL · Israel | 2 |
US · United States | 1 |
KR · South Korea | 1 |
CA · Canada | 1 |
BE · Belgium | 1 |
PL · Poland | 1 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS208988 · Buchholz Digital GmbH | 5 |
AS8473 · Bahnhof AB | 2 |
AS12849 · Hot-Net internet services Ltd. | 2 |
AS7922 · Comcast Cable Communications, LLC | 1 |
AS9318 · SK Broadband Co Ltd | 1 |
AS6848 · Telenet BV | 1 |
AS8434 · Telenor Sverige AB | 1 |
AS812 · Rogers Communications Canada Inc. | 1 |
AS49242 · Internet Union Sp. z o.o. | 1 |
TLS supported groups
| fingerprint | co-occurrences |
|---|---|
001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, php-guzzle 8.3.1, curl 7.88.1, +10 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1, python-requests 2.34.2, curl 8.23.0, +4 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |