TCP SYN (p0f)
4:55+9:0:1460:mss*29,10:mss,sok,ts,nop,ws:df,id+:0
first seen 2026-07-01 14:41 · last seen 2026-09-01 03:26 · JSON
Distinct clients per day (last 30 days, peak 1/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 | 55+9 |
| Options length | 0 |
| MSS | 1460 |
| Window size | mss*29 |
| 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 |
|---|---|
t13d5911h1_a33745022dd6_1f22a2ca17c4 Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 23.11.1.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
t13d311000_e8f1e7e78f70_e1d1bdc3e2a2 | 1 |
t13d1515h1_8daaf6152771_0a20fe35d3a5 | 1 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge11nn07enus_6c5989145a61_000000000000_000000000000 | 1 |
ge11nn05en00_978ba9f30f5e_000000000000_000000000000 | 1 |
ge11nn13enus_9db22d02e17a_000000000000_000000000000 | 1 |
TCP SYN (JA4T)
| fingerprint | co-occurrences |
|---|---|
42340_2-4-8-1-3_1460_10 | 3 |
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
SG · Singapore | 2 |
FI · Finland | 1 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS20473 · The Constant Company, LLC | 2 |
AS202147 · VPSUS LTD | 1 |