TCP SYN (JA4T)
65535_2-4-8-1-3_1380_8
first seen 2026-07-01 15:48 · last seen 2026-10-31 01:03 · JSON
Last 7 days (2204 observations)
Distinct clients per day (last 30 days, peak 485/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 | 1380 |
| 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 |
|---|---|
t13d3111h2_e8f1e7e78f70_5ac7197df9d2 | 59253 |
t13d4412h1_fd39b124ee10_58ed7828516f | 39 |
t13d1515h1_8daaf6152771_0a20fe35d3a5 | 19 |
t13d1515h1_8daaf6152771_de4a06bb82e3 | 16 |
t13d131100_f57a46bbacb6_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.5, go-net/http 1.26.4.The fingerprint page shows the full measured match list. More on the catalog. | 11 |
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. | 9 |
t13d4312h1_c7886603b240_b26ce05bbdd6 | 6 |
t13d2212h1_3522af84f765_8d633dac7124 | 2 |
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. | 2 |
t13d1516h1_8daaf6152771_1a63afa7c478 | 2 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge20nn030000_80b089f68b8e_000000000000_000000000000 | 28120 |
ge20nn09enus_c5abe4666a67_000000000000_000000000000 | 18081 |
ge20nn020000_e5a56608905c_000000000000_000000000000 | 5730 |
ge20nn030000_6dac75bd47eb_000000000000_000000000000 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. | 5129 |
ge20nn070000_1903711a2262_000000000000_000000000000 | 1448 |
ge20nn040000_3dccbaa13f05_000000000000_000000000000 | 352 |
ge20nn11enus_08fd186dd996_000000000000_000000000000 | 288 |
ge20nn030000_0d4c7aba53a3_000000000000_000000000000 | 59 |
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. | 45 |
ge11nn13enus_9db22d02e17a_000000000000_000000000000 | 28 |
HTTP/2 frames (Akamai)
| fingerprint | co-occurrences |
|---|---|
1:4096;2:0;5:16384;6:131072;3:100;4:65536|26148865|0|m,s,p,a | 49092 |
1:4096;2:0;5:16384;6:131072;3:100;4:65536;11105:65535;11106:65535;11107:65535;11108:10;11109:10|26148865|0|m,s,p,a | 10161 |
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. | 10 |
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. | 3 |
3:100;4:33554432;2:0|33488897|0|m,p,s,a Match?Exact match in Thumbprint's published controlled catalog captures: php-curl 7.88.1, curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
4:2097152;3:100|10485760|1:0:0:255|m,s,p,a | 1 |
TCP SYN (p0f)
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
US · United States | 54123 |
DE · Germany | 1733 |
SG · Singapore | 1725 |
GB · United Kingdom | 1686 |
NG · Nigeria | 13 |
CN · China | 11 |
ZA · South Africa | 10 |
AE · United Arab Emirates | 10 |
KW · Kuwait | 9 |
EG · Egypt | 9 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS32934 · Facebook, Inc. | 59256 |
AS29465 · MTN NIGERIA Communication limited | 13 |
AS15802 · Emirates Integrated Telecommunications Company PJSC | 10 |
AS47589 · Kuwait Telecommunications Company K.S.C.C. | 9 |
AS21928 · T-Mobile USA, Inc. | 7 |
AS33771 · Safaricom Limited | 5 |
AS8452 · TE-AS | 5 |
AS9051 · IncoNet Data Management sal | 5 |
AS36994 · Vodacom | 5 |
AS11664 · Techtel LMDS Comunicaciones Interactivas S.A. | 4 |
TLS supported groups
| fingerprint | co-occurrences |
|---|---|
001d,0017,001e,0019,0018 | 5580 |
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. | 11 |
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. | 5 |
0a0a,001d,0017,0018 | 1 |
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. | 1 |