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 2026-10-31 21:01 · JSON
Last 7 days (5 observations)
Distinct clients per day (last 30 days, peak 57/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 |
|---|---|
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. | 56 |
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. | 42 |
t13d101000_61a7ad8aa9b6_3ea2f44fd1af | 32 |
t13d1713h1_5b57614c22b0_eca864cca44a | 22 |
t13d1513h2_8daaf6152771_eca864cca44a | 21 |
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. | 18 |
t13i170900_5b57614c22b0_78e6aca7449b | 10 |
t12d070400_67e63544eb68_b4ef8340317f | 10 |
t13d1514h2_8daaf6152771_43ade6aba3df | 8 |
t13d4312h1_c7886603b240_b26ce05bbdd6 | 7 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge20nn030000_bf75ddd0bb29_000000000000_000000000000 | 56 |
ge11nn050000_fdb72fc7d4c1_000000000000_000000000000 | 28 |
ge20nn020000_b89ce445e0b3_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13, go-net/http 1.27.1, go-net/http 1.27.3, +14 more.The fingerprint page shows the full measured match list. More on the catalog. | 20 |
ge20nr12enus_7f8aecb7bbee_000000000000_000000000000 | 15 |
ge11nn040000_4f6f4aad0c1e_000000000000_000000000000 | 11 |
ge20nn14enus_e6dae214b9be_000000000000_000000000000 | 9 |
ge11nn030000_58c83775e1a3_000000000000_000000000000 | 7 |
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. | 7 |
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, +39 more.The fingerprint page shows the full measured match list. More on the catalog. | 7 |
ge20nn13enus_fcb564d9f630_000000000000_000000000000 | 7 |
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. | 57 |
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. | 29 |
4:16777216|16711681|0|m,p,a,s | 29 |
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 155.0.1, +32 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, +26 more.The fingerprint page shows the full measured match list. More on the catalog. | 7 |
1:65536;2:0;4:6291456;6:262144|15663105|7:1:0:220|m,a,s,p | 7 |
1:65536;2:0;4:6291456;6:262144|15663105|9:1:0:220|m,a,s,p | 7 |
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. | 6 |
1:65536;2:0;4:6291456;6:262144|15663105|3:1:1:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.128, chrome 150.0.7871.115, chrome 154.0.8037.58, +8 more.The fingerprint page shows the full measured match list. More on the catalog. | 5 |
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 156.0.8078.48, chrome 150.0.7871.128, +3 more.The fingerprint page shows the full measured match list. More on the catalog. | 3 |
TCP SYN (JA4T)
| fingerprint | co-occurrences |
|---|---|
64240_2-4-8-1-3_1460_10 | 261 |
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
NL · Netherlands | 79 |
US · United States | 62 |
DE · Germany | 52 |
CH · Switzerland | 36 |
TR · Turkey | 14 |
ID · Indonesia | 12 |
JP · Japan | 6 |
FR · France | 5 |
AU · Australia | 4 |
LT · Lithuania | 4 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS132892 · Cloudflare, Inc. | 56 |
AS202623 · Cloudflare Inc | 56 |
AS211619 · MAXKO d.o.o. | 51 |
AS13030 · Init7 (Switzerland) Ltd. | 35 |
AS219502 · Storm Industries LLC | 28 |
AS150273 · PT Berkah Maju Interasional | 8 |
AS63949 · Akamai Connected Cloud | 5 |
AS38195 · Superloop | 4 |
AS214472 · Offshore LC | 4 |
AS267784 · Flyservers S.A. | 4 |
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. | 57 |
001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, php-guzzle 8.3.1, curl 7.88.1, +10 more.The fingerprint page shows the full measured match list. More on the catalog. | 6 |
0a0a,11ec,001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 156.0.8078.48, edge 155.0.4283.62, chrome 156.0.8078.47, +11 more.The fingerprint page shows the full measured match list. More on the catalog. | 6 |
11ec,11eb,11ed,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.27.3, go-net/http 1.26.10.The fingerprint page shows the full measured match list. More on the catalog. | 4 |
001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.12.28, rust-reqwest 0.11.27, winhttp 10.0.20348.1, +2 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
11ec,001d,001e,0019,0018,0017,0021,0020,001f | 1 |
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 |