TCP SYN (JA4T)
42340_2-4-8-1-3_1460_12
first seen 2026-06-30 13:03 · last seen 2026-09-16 07:01 · JSON
Last 7 days (76 observations)
Distinct clients per day (last 30 days, peak 11/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 | 42340 |
|---|---|
| Option kinds | 2-4-8-1-3 |
| MSS | 1460 |
| Window scale | 12 |
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 |
|---|---|
t12d280900_0df5e5c63df4_5c2ba2672724 | 91 |
t13d131000_f57a46bbacb6_e7c285222651 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.23.12.The fingerprint page shows the full measured match list. More on the catalog. | 70 |
t13d251100_b78ed14e2fd0_ab7e3b40a677 | 33 |
t13d190900_9dc949149365_97f8aa674fd9 | 28 |
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. | 28 |
t13d1011h2_18ef40b21276_879711aa9f16 | 25 |
t13d1312h1_f57a46bbacb6_ab7e3b40a677 | 17 |
t13d191000_9dc949149365_e7c285222651 | 16 |
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. | 14 |
t13d181100_85036bcba153_d41ae481755e | 13 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge10nr040000_532a1ee47909_000000000000_000000000000 | 91 |
ge11nn050000_57c5e92682a8_000000000000_000000000000 | 44 |
ge11nr030000_cd680697de12_000000000000_000000000000 | 42 |
ge11nn030000_cd680697de12_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: powershell 7.6.5, powershell 7.6.4, go-net/http 1.27.0, +7 more.The fingerprint page shows the full measured match list. More on the catalog. | 27 |
ge20nn14enus_068ebe3632ec_000000000000_000000000000 | 25 |
ge11nn040000_8391bea91fb6_000000000000_000000000000 | 17 |
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. | 15 |
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. | 14 |
ge11nr050000_57c5e92682a8_000000000000_000000000000 | 10 |
ge11nr05enus_900748f1e0f3_000000000000_000000000000 | 6 |
HTTP/2 frames (Akamai)
| fingerprint | co-occurrences |
|---|---|
0|00|0|m,s,a,p | 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. | 17 |
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. | 6 |
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. | 3 |
2:0;4:2097152;3:100;9:1|10485760|0|m,s,p,a | 2 |
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. | 1 |
2:0;4:4194304;6:10485760|1073741824|0|a,m,p,s Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13, go-net/http 1.23.12.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
1:65536;4:131072;5:16384|12517377|3:0:0:201,5:0:0:101,7:0:0:1,9:0:7:1,11:0:3:1,13:0:0:241,15:0:13:42|m,p,a,s | 1 |
1:65536;4:131072;5:16384|12517377|3:0:0:201,5:0:0:101,7:0:0:1,9:0:7:1,11:0:3:1,13:0:0:241,17:0:13:42|m,p,a,s | 1 |
1:65536;4:131072;5:16384|12517377|3:0:0:201,5:0:0:101,7:0:0:1,9:0:7:1,11:0:3:1,13:0:0:241,19:0:13:42|m,p,a,s | 1 |
TCP SYN (p0f)
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
NL · Netherlands | 319 |
FR · France | 40 |
US · United States | 17 |
SG · Singapore | 5 |
GB · United Kingdom | 1 |
PL · Poland | 1 |
IE · Ireland | 1 |
VN · Vietnam | 1 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS48090 · TECHOFF SRV LIMITED | 200 |
AS211486 · Alferov Aleksey Aleksandrovich | 37 |
AS205997 · Vlad Cojuhari | 28 |
AS211590 · Bucklog SARL | 25 |
AS213474 · HomeLine Broadband LLC | 25 |
AS203020 · HostRoyale Technologies Pvt Ltd | 14 |
AS49870 · Alsycon B.V. | 13 |
AS150303 · SoloRDP | 9 |
AS213388 · IIC RAIL LIMITED | 8 |
AS138997 · Eons Data Communications Limited | 5 |
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 |
|---|---|
q13d0312h3_55b375c5d22e_178839b6cec1 | 3 |