TCP SYN (p0f)

4:113+15:0:1289:mss*44,10:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-09-03 12:38 · last seen 2026-09-03 12:38 · 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 TTL113+15
Options length0
MSS1289
Window sizemss*44
Window scale10
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
t13d2613h2_2802a3db6c62_845d286b0d671

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr08isis_1945e0741196_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
4:4194304;3:100|10485760|1:0:0:255|m,s,p,a1

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1289_101

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (iPhone; CPU iPhone OS 17_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.6 Mobile/15E148 Safari/604.11

Country

fingerprintco-occurrences
IS · Iceland1

Network (ASN)

fingerprintco-occurrences
AS206804 · EstNOC OU1