TCP SYN (p0f)
4:47+17:0:1460:mss*44,9:mss,sok,ts,nop,ws:df,id+:0
first seen 2026-07-03 18:49 · last seen 2026-10-23 22:39 · JSON
Distinct clients per day (last 30 days, peak 15/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 | 47+17 |
| Options length | 0 |
| MSS | 1460 |
| Window size | mss*44 |
| Window scale | 9 |
| 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 | 17 |
t13d1714h1_5b57614c22b0_43ade6aba3df | 5 |
t13d311100_e8f1e7e78f70_d41ae481755e Match?Exact match in Thumbprint's published controlled catalog captures: rust-hyper 1.11.1, rust-hyper 1.11.0, rust-hyper 1.12.0, +1 more.The fingerprint page shows the full measured match list. More on the catalog. | 3 |
t13d521100_b262b3658495_8e6e362c5eac | 2 |
t12d430700_1ce71f0edbb1_269097225c9f | 2 |
t13d4312h1_c7886603b240_b26ce05bbdd6 | 1 |
t13d1910h1_9dc949149365_97f8aa674fd9 | 1 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge20nn030000_bf75ddd0bb29_000000000000_000000000000 | 15 |
ge11nn08enus_0e9bd3873e9d_000000000000_000000000000 | 5 |
ge11nn040000_e1d2031bdfea_000000000000_000000000000 | 4 |
ge20nn020000_5594a17e7e7e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.13.0, +11 more.The fingerprint page shows the full measured match list. More on the catalog. | 2 |
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. | 1 |
ge11nn050000_2469c960a647_000000000000_000000000000 | 1 |
ge11nn040000_08e7224bf8c7_000000000000_000000000000 | 1 |
he11nn040000_5192a00d9159_000000000000_000000000000 | 1 |
ge11nn05engl_2b07ea22e586_000000000000_000000000000 | 1 |
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. | 17 |
TCP SYN (JA4T)
| fingerprint | co-occurrences |
|---|---|
64240_2-4-8-1-3_1460_9 | 31 |
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
NL · Netherlands | 17 |
FR · France | 3 |
CN · China | 3 |
DE · Germany | 2 |
HK · Hong Kong SAR China | 2 |
US · United States | 1 |
SG · Singapore | 1 |
ID · Indonesia | 1 |
RS · Serbia | 1 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS63949 · Akamai Connected Cloud | 14 |
AS197170 · TechTies Inc. | 7 |
AS24940 · Hetzner Online GmbH | 2 |
AS4134 · CHINANET BACKBONE | 2 |
AS136907 · HUAWEI CLOUDS | 2 |
AS14061 · DigitalOcean, LLC | 1 |
AS211619 · MAXKO d.o.o. | 1 |
AS137266 · CHINATELECOM Hubei province Wuhan 5G network | 1 |
AS12322 · Free SAS | 1 |
TLS supported groups
| fingerprint | co-occurrences |
|---|---|
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.22.1, python-httpx 0.28.1, python-requests 2.34.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog. | 16 |
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. | 1 |