TCP SYN (p0f)

4:108+20:0:1380:65535,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:0

first seen 2026-06-21 00:01 · last seen 2026-06-23 12:17 · JSON

Decomposed attributes

IP version4
Initial TTL108+20
Options length0
MSS1380
Window size65535
Window scale8
Options layoutmss,nop,ws,nop,nop,sok
Quirksdf,id+,ecn
Payload class0

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)

fingerprintco-occurrences
t12d080700_0df93f53a2f9_2dae41c691ec1
t12d180700_4b22cbed5bed_2dae41c691ec1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn030000_341eb0d8946c_000000000000_0000000000001
ge11nn040000_cf1edba2959c_000000000000_0000000000001

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36 OPR/108.0.0.01
Mozilla/5.0 (Windows NT 10.0; Win64; rv:143.0) Gecko/20100101 Firefox/143.01

Country

fingerprintco-occurrences
JP · Japan2

Network (ASN)

fingerprintco-occurrences
AS63949 · Akamai Connected Cloud2