TCP SYN (p0f)
4:115+13:0:1380:65535,8:mss,nop,ws,nop,nop,sok:df,id+:0
first seen 2026-06-19 13:31 · last seen 2026-10-23 22:26 · 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 | 115+13 |
| Options length | 0 |
| MSS | 1380 |
| Window size | 65535 |
| Window scale | 8 |
| Options layout | mss,nop,ws,nop,nop,sok |
| 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 |
|---|---|
t12d180700_4b22cbed5bed_2dae41c691ec | 9 |
t13d3013h2_1d37bd780c83_8537cf56674e | 1 |
HTTP request (JA4H)
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. | 1 |
TCP SYN (JA4T)
| fingerprint | co-occurrences |
|---|---|
65535_2-1-3-1-1-4_1380_8 | 5 |
User-Agent
Country
| fingerprint | co-occurrences |
|---|---|
JP · Japan | 9 |
ES · Spain | 1 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS63949 · Akamai Connected Cloud | 7 |
AS21859 · Zenlayer Inc | 1 |
AS9009 · M247 Europe SRL | 1 |
AS4685 · Asahi Net | 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. | 1 |