TCP SYN (JA4T)
64240_2-4-8-1-3_1200_7
first seen 2026-07-17 05:43 · last seen 2026-10-28 05:59 · JSON
Last 7 days (2 observations)
Distinct clients per day (last 30 days, peak 14/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 | 64240 |
|---|---|
| Option kinds | 2-4-8-1-3 |
| MSS | 1200 |
| 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 |
|---|---|
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. | 14 |
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. | 11 |
t13d1517h2_8daaf6152771_b1ff8ab2d16f | 3 |
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. | 2 |
t13d4412h1_fd39b124ee10_58ed7828516f | 2 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge20nn030000_bf75ddd0bb29_000000000000_000000000000 | 14 |
ge20nr08ruru_48f5c0c9641d_000000000000_000000000000 | 3 |
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. | 2 |
ge20nr08enus_48f5c0c9641d_000000000000_000000000000 | 2 |
ge20nr08trtr_48f5c0c9641d_000000000000_000000000000 | 2 |
ge20nr11kkkz_351166502e22_000000000000_000000000000 | 2 |
ge20nr11enus_351166502e22_000000000000_000000000000 | 2 |
ge20nn09enus_58cd8a8d2455_000000000000_000000000000 | 1 |
ge20nn09kkkz_58cd8a8d2455_000000000000_000000000000 | 1 |
ge20nr11trtr_351166502e22_000000000000_000000000000 | 1 |
HTTP/2 frames (Akamai)
| fingerprint | co-occurrences |
|---|---|
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. | 14 |
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, +85 more.The fingerprint page shows the full measured match list. More on the catalog. | 12 |
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, +60 more.The fingerprint page shows the full measured match list. More on the catalog. | 2 |
TCP SYN (p0f)
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
US · United States | 19 |
RU · Russia | 3 |
KZ · Kazakhstan | 3 |
TR · Turkey | 3 |
BR · Brazil | 2 |
VE · Venezuela | 1 |
BA · Bosnia & Herzegovina | 1 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS52393 · Corporación Dana S.A. | 8 |
AS16509 · Amazon.com, Inc. | 3 |
AS12389 · PJSC Rostelecom | 3 |
AS208450 · Megahost Kazakhstan TOO | 3 |
AS215540 · GLOBAL CONNECTIVITY SOLUTIONS LLP | 3 |
AS3257 · GTT Communications Inc. | 2 |
AS14618 · Amazon.com, Inc. | 2 |
AS267575 · MARANET TELECOM LTDA | 2 |
AS263179 · Webline Services, S.A. | 2 |
AS263740 · Corporacion Laceibanetsociety | 1 |
TLS supported groups
| fingerprint | co-occurrences |
|---|---|
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. | 14 |
11ec,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 158.0.1, firefox 157.0, firefox 157.0.1, +5 more.The fingerprint page shows the full measured match list. More on the catalog. | 2 |
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).
| fingerprint | linked observations |
|---|---|
q13d0311h3_55b375c5d22e_5a1f323ef56d | 6 |