TCP SYN (p0f)
4:48+16:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:0
first seen 2026-06-11 00:35 · last seen 2026-09-15 12:28 · JSON
Last 7 days (6 observations)
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
| IP version | 4 |
|---|---|
| Initial TTL | 48+16 |
| Options length | 0 |
| MSS | 1460 |
| Window size | mss*44 |
| Window scale | 10 |
| Options layout | mss,sok,ts,nop,ws |
| Quirks | df,id+ |
| Payload class | 0 |
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_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. | 25 |
t13d101000_61a7ad8aa9b6_3ea2f44fd1af | 18 |
t13d1717h2_5b57614c22b0_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 148.0.2, firefox 144.0.2, firefox 142.0.1, +6 more.The fingerprint page shows the full measured match list. More on the catalog. | 6 |
t13d620700_d9d1031b8abc_606f088c1349 | 5 |
t12d200700_22c523c4c553_2dae41c691ec | 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. | 4 |
t13d1614h2_86a278354501_53a6d0ab1c42 | 2 |
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. | 2 |
t13d3112h2_e8f1e7e78f70_b26ce05bbdd6 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.5.0, php-curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog. | 2 |
t13i170900_5b57614c22b0_78e6aca7449b | 2 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge11nn050000_fdb72fc7d4c1_000000000000_000000000000 | 14 |
ge20nn13enus_fcb564d9f630_000000000000_000000000000 | 7 |
ge20nn12enus_77c6e3cbf1d4_000000000000_000000000000 | 6 |
ge11nn020000_3ed38b250d3d_000000000000_000000000000 | 5 |
ge20nn11enus_dbdd560af68b_000000000000_000000000000 | 5 |
ge11nn040000_608e01151bf4_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog. | 4 |
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. | 4 |
ge20nr12ru00_54b4638ab28b_000000000000_000000000000 | 4 |
ge11nn030000_341eb0d8946c_000000000000_000000000000 | 2 |
ge20nn10enus_e3fec2e5db35_000000000000_000000000000 | 2 |
HTTP/2 frames (Akamai)
| fingerprint | co-occurrences |
|---|---|
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. | 24 |
1:65536;2:0;4:131072;5:16384|12517377|3:0:0:22|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 154.0, +25 more.The fingerprint page shows the full measured match list. More on the catalog. | 10 |
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. | 5 |
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. | 2 |
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. | 1 |
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. | 1 |
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. | 1 |
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. | 1 |
TCP SYN (JA4T)
| fingerprint | co-occurrences |
|---|---|
64240_2-4-8-1-3_1460_10 | 51 |
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
CH · Switzerland | 34 |
TR · Turkey | 14 |
NL · Netherlands | 5 |
AU · Australia | 4 |
KZ · Kazakhstan | 4 |
FR · France | 3 |
US · United States | 2 |
ID · Indonesia | 2 |
IT · Italy | 2 |
CY · Cyprus | 2 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS13030 · Init7 (Switzerland) Ltd. | 33 |
AS219502 · Storm Industries LLC | 14 |
AS38195 · Superloop | 4 |
AS214472 · Offshore LC | 4 |
AS199524 · G-Core Labs S.A. | 4 |
AS206092 · F.N.S. HOLDINGS LIMITED | 3 |
AS35432 · Cablenet Communication Systems plc | 2 |
AS3215 · Orange S.A. | 2 |
AS11351 · Charter Communications Inc | 2 |
AS150273 · PT Berkah Maju Interasional | 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_653d80c3fe9d | 4 |
q13d0315h3_55b375c5d22e_bb76f32061e3 | 2 |
q13d0314h3_55b375c5d22e_61e396c58b1f | 1 |
q13d0314h3_55b375c5d22e_1ecea7cb6ec1 | 1 |