TCP SYN (p0f)

4:116+12:0:1460:65535,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:0

first seen 2026-08-26 07:15 · last seen 2026-08-28 15:40 · JSON

Distinct clients per day (last 30 days, peak 2/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 version4
Initial TTL116+12
Options length0
MSS1460
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
t13d1712h1_ab0a1bf427ad_8e6e362c5eac2
t13d1812h1_85036bcba153_d41ae481755e1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn050000_444220f7ef68_000000000000_0000000000003

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-1-3-1-1-4_1460_83

User-Agent

fingerprintco-occurrences
Python/3.14 aiohttp/3.14.32
Python/3.13 aiohttp/3.14.31

Country

fingerprintco-occurrences
FR · France3

Network (ASN)

fingerprintco-occurrences
AS51167 · Contabo GmbH3