TCP SYN (p0f)

4:44+20:0:1380:65535,11:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-09-02 06:31 · last seen 2026-09-02 06:31 · 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 TTL44+20
Options length0
MSS1380
Window size65535
Window scale11
Options layoutmss,sok,ts,nop,ws
Quirksdf,id+
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
t13d131100_f57a46bbacb6_e5728521abd41

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr030000_cd680697de12_000000000000_0000000000001

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-4-8-1-3_1380_111

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
CA · Canada1

Network (ASN)

fingerprintco-occurrences
AS174 · Cogent Communications, LLC1