TCP SYN (JA4T)
42600_2-4-8-1-3_1420_7
first seen 2026-06-29 23:12 · last seen 2026-09-16 02:05 · JSON
Last 7 days (26 observations)
Distinct clients per day (last 30 days, peak 10/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 | 42600 |
|---|---|
| Option kinds | 2-4-8-1-3 |
| MSS | 1420 |
| 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 |
|---|---|
t13d1711h2_5b57614c22b0_5894756fee65 | 125 |
t13d3012h2_1d37bd780c83_8e6e362c5eac | 46 |
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. | 39 |
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, +24 more.The fingerprint page shows the full measured match list. More on the catalog. | 17 |
t13d181100_85036bcba153_d41ae481755e | 12 |
t13d1011h2_61a7ad8aa9b6_3fcd1a44f3e3 Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.12.28.The fingerprint page shows the full measured match list. More on the catalog. | 9 |
t13d301000_1d37bd780c83_3550537cd59b | 9 |
t13d3013h1_1d37bd780c83_8537cf56674e | 8 |
t12d500700_5e02f30799ee_269097225c9f | 5 |
t13d4312h1_c7886603b240_b26ce05bbdd6 | 5 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge20nn030000_bf75ddd0bb29_000000000000_000000000000 | 55 |
he20nn030000_bf75ddd0bb29_000000000000_000000000000 | 36 |
he20nn040000_8e83c27df1d3_000000000000_000000000000 | 34 |
ge20nn030000_ff50983941c1_000000000000_000000000000 | 32 |
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. | 18 |
ge20nn13enus_0c2c1d640f3e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 151.0.7922.137, chrome 151.0.7922.170, chrome 151.0.7922.108, +23 more.The fingerprint page shows the full measured match list. More on the catalog. | 17 |
ge20nr12enus_54b4638ab28b_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 151.0.7922.137, edge 151.0.4129.93, +36 more.The fingerprint page shows the full measured match list. More on the catalog. | 16 |
ge20nr030000_ff50983941c1_000000000000_000000000000 | 14 |
ge11nn14engb_c70c3fb4283f_000000000000_000000000000 | 12 |
ge20nr12enus_9c600a72754c_000000000000_000000000000 | 11 |
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, +7 more.The fingerprint page shows the full measured match list. More on the catalog. | 125 |
2:0;4:2097152;5:16384;6:16384|5177345|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.13.4, rust-reqwest 0.12.28, rust-reqwest 0.13.5, +3 more.The fingerprint page shows the full measured match list. More on the catalog. | 53 |
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 149.0.7827.102, +59 more.The fingerprint page shows the full measured match list. More on the catalog. | 25 |
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. | 21 |
2:0;4:4194304;5:16384;6:10485760|1073741824|0|a,m,p,s Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.8, go-net/http 1.26.7, +6 more.The fingerprint page shows the full measured match list. More on the catalog. | 4 |
1:65536;2:0;4:6291456;6:262144|15663105|3:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 151.0.7922.34, chromium 147.0.7727.15, chromium 145.0.7632.6, +21 more.The fingerprint page shows the full measured match list. More on the catalog. | 3 |
1:65536;2:0;4:6291456;6:262144|15663105|5:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 133.0.6943.16, chrome 150.0.7871.128, chromium 148.0.7778.96, +2 more.The fingerprint page shows the full measured match list. More on the catalog. | 3 |
1:65536;2:0;4:6291456;6:262144|15663105|7:1:0:220|m,a,s,p | 2 |
2:0;4:2097152;5:16384;6:16777216|5177345|0|m,s,a,p | 2 |
1:65536;2:0;4:6291456;6:262144|15663105|9:1:0:220|m,a,s,p | 1 |
TCP SYN (p0f)
| fingerprint | co-occurrences |
|---|---|
4:57+7:0:1420:mss*30,7:mss,sok,ts,nop,ws:df,id+:0 | 291 |
4:56+8:0:1420:mss*30,7:mss,sok,ts,nop,ws:df,id+:0 | 6 |
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
US · United States | 274 |
BE · Belgium | 11 |
NL · Netherlands | 10 |
SA · Saudi Arabia | 2 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS396982 · Google LLC | 297 |
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_653d80c3fe9d | 4 |