TCP SYN (JA4T)
21900_2-4-8-1-3_1460_9
first seen 2026-07-13 03:18 · last seen 2026-09-07 01:01 · JSON
Distinct clients per day (last 30 days, peak 2/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 | 21900 |
|---|---|
| Option kinds | 2-4-8-1-3 |
| MSS | 1460 |
| 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 |
|---|---|
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 |
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. | 4 |
t13d1517h2_8daaf6152771_cb7bf5808d99 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 152.0.7977.83, chrome 152.0.7977.64, chrome 152.0.7977.65, +5 more.The fingerprint page shows the full measured match list. More on the catalog. | 3 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
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. | 8 |
ge20nn13enus_daf415dbcf20_000000000000_000000000000 | 1 |
ge20nn13enus_139640deb3ec_000000000000_000000000000 | 1 |
ge20nr13enus_99d37a3209eb_000000000000_000000000000 | 1 |
ge20nr13enus_07be69a2e595_000000000000_000000000000 | 1 |
ge20nn13enus_482612a8c9e9_000000000000_000000000000 | 1 |
ge20nr13enus_2dccb4e675d3_000000000000_000000000000 | 1 |
ge20nr13enus_0f6356503bff_000000000000_000000000000 | 1 |
ge20nr13enus_f9d35445bedb_000000000000_000000000000 | 1 |
ge20nr13enus_ec0d4648c301_000000000000_000000000000 | 1 |
HTTP/2 frames (Akamai)
| fingerprint | co-occurrences |
|---|---|
1:65536;2:0;4:6291456;6:262144|15663105|0|m,a,s,p | 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 149.0.7827.102, +59 more.The fingerprint page shows the full measured match list. More on the catalog. | 4 |
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. | 2 |
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. | 2 |
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. | 2 |
TCP SYN (p0f)
| fingerprint | co-occurrences |
|---|---|
4:47+17:0:1460:mss*15,9:mss,sok,ts,nop,ws:df,id+:0 | 10 |
4:57+7:0:1460:mss*15,9:mss,sok,ts,nop,ws:df,id+:0 | 10 |
4:48+16:0:1460:mss*15,9:mss,sok,ts,nop,ws:df,id+:0 | 4 |
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
US · United States | 14 |
ES · Spain | 10 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS16276 · OVH SAS | 14 |
AS63023 · GTHost | 10 |