TCP SYN (JA4T)
43200_2-4-8-1-3_1440_9
first seen 2026-07-01 15:09 · last seen 2026-10-31 01:28 · JSON
Last 7 days (113 observations)
Distinct clients per day (last 30 days, peak 24/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 | 43200 |
|---|---|
| Option kinds | 2-4-8-1-3 |
| MSS | 1440 |
| Window scale | 9 |
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 |
|---|---|
t13d3515h1_8f004308c246_5c2c66f702b0 | 354 |
t13d131200_f57a46bbacb6_9249cab70c77 | 34 |
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. | 17 |
t13d1517h2_8daaf6152771_b1ff8ab2d16f | 7 |
t13d3013h2_1d37bd780c83_8537cf56674e | 4 |
t13d141000_cbb2034c60b8_e7c285222651 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.22.12.The fingerprint page shows the full measured match list. More on the catalog. | 3 |
t13d1713h1_ab0a1bf427ad_89ab6efea773 | 2 |
t13d131100_f57a46bbacb6_e5728521abd4 | 1 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge11nn050000_a1c329e38462_000000000000_000000000000 | 285 |
ge11nn050000_3658ef221638_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: wget 1.21.4, wget 1.25.0, wget 1.21.3.The fingerprint page shows the full measured match list. More on the catalog. | 69 |
ge20nr13enus_e2ac93ffb364_000000000000_000000000000 | 24 |
ge11nr040000_e1d2031bdfea_000000000000_000000000000 | 13 |
ge11nr05enus_f3bb7aa45ec4_000000000000_000000000000 | 8 |
ge11nn040000_e1d2031bdfea_000000000000_000000000000 | 7 |
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. | 3 |
ge11nr030000_cd680697de12_000000000000_000000000000 | 3 |
ge11nn05enus_f3bb7aa45ec4_000000000000_000000000000 | 3 |
po11nn060000_a35477c4bdb5_000000000000_000000000000 | 2 |
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. | 24 |
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. | 4 |
TCP SYN (p0f)
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
NL · Netherlands | 155 |
GB · United Kingdom | 114 |
DE · Germany | 96 |
US · United States | 28 |
SG · Singapore | 24 |
FR · France | 3 |
JP · Japan | 2 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS25369 · Hydra Communications Ltd | 354 |
AS22295 · Advin Services LLC | 27 |
AS62610 · Zenlayer Inc | 24 |
AS206216 · Advin Services LLC | 7 |
AS63949 · Akamai Connected Cloud | 3 |
AS16276 · OVH SAS | 3 |
AS393886 · Leaseweb USA, Inc. | 3 |
AS53667 · FranTech Solutions | 1 |
TLS supported groups
| fingerprint | co-occurrences |
|---|---|
001d,0017,0018,0019,0100,0101 | 247 |
0a0a,001d,0017,0018 | 24 |
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. | 1 |