TCP SYN (p0f)
4:239+16:0:1420:mss*42,8:mss,nop,ws,sok,eol+1:df,id+:0
first seen 2026-07-24 12:26 · last seen 2026-07-25 07:15 · JSON
Decomposed attributes
| IP version | 4 |
|---|
| Initial TTL | 239+16 |
|---|
| Options length | 0 |
|---|
| MSS | 1420 |
|---|
| Window size | mss*42 |
|---|
| Window scale | 8 |
|---|
| Options layout | mss,nop,ws,sok,eol+1 |
|---|
| 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)
HTTP request (JA4H)
HTTP/2 frames (Akamai)
| fingerprint | co-occurrences |
|---|
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 154.0, +25 more.The fingerprint page shows the full measured match list. More on the catalog. | 3 |
1:65536;2:0;4:131072;5:16384|12517377|3:0:0:42|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 152.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
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 149.0.7827.102, +59 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
TCP SYN (JA4T)
User-Agent
Country
| fingerprint | co-occurrences |
|---|
FR · France | 5 |
Network (ASN)
| fingerprint | co-occurrences |
|---|
AS15557 · Societe Francaise Du Radiotelephone - SFR SA | 5 |
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).