TCP SYN (p0f)

4:40+24:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+,ecn:0

first seen 2026-08-18 03:55 · last seen 2026-08-18 06:03 · 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 version4
Initial TTL40+24
Options length0
MSS1460
Window sizemss*44
Window scale10
Options layoutmss,sok,ts,nop,ws
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
t13d1211h2_b6ed4f860ade_9ced094328c91
t13d1210h2_715d088b666e_5603904660151

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn04enus_989c7cc05c9b_000000000000_0000000000002

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:6291456;6:262144;4:1048576|15663105|1:0:0:256|m,a,s,p2

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_102

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.4 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.7 Safari/537.361

Country

fingerprintco-occurrences
RO · Romania2

Network (ASN)

fingerprintco-occurrences
AS200651 · FlokiNET ehf2