TCP SYN (p0f)
4:49+15:0:1400:mss*29,9:mss,sok,ts,nop,ws:df,id+:0
first seen 2026-10-09 23:01 · last seen 2026-10-23 22:06 · 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 | 49+15 |
| Options length | 0 |
| MSS | 1400 |
| Window size | mss*29 |
| 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 |
|---|---|
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. | 1 |
t13d3013h2_1d37bd780c83_8537cf56674e | 1 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge11nn050000_ea6f06182064_000000000000_000000000000 | 1 |
ge20nn030000_bf75ddd0bb29_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. | 1 |
TCP SYN (JA4T)
| fingerprint | co-occurrences |
|---|---|
42340_2-4-8-1-3_1400_9 | 2 |
User-Agent
| fingerprint | co-occurrences |
|---|---|
curl/8.14.1 | 1 |
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 Chrome/140.0.0.0 Safari/537.36 | 1 |
Country
| fingerprint | co-occurrences |
|---|---|
EE · Estonia | 1 |
FI · Finland | 1 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS218731 · Andris Jakovlevs | 1 |
AS213702 · QWINS LTD | 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 |