TCP SYN (p0f)

4:46+18:0:1390:65535,12:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-10-13 03:49 · last seen 2026-10-13 05:17 · 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 TTL46+18
Options length0
MSS1390
Window size65535
Window scale12
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
t13d1713h2_5b57614c22b0_02c8e53ee3981
t13d1712h2_5b57614c22b0_d5fe2c511efa1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr040000_ac162d8a7b0c_000000000000_0000000000002

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;1:4096;8:0;3:1024;4:1048576|25100289|0|a,p,m,s2

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-4-8-1-3_1390_122

User-Agent

fingerprintco-occurrences
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; GPTBot/1.4; +https://openai.com/gptbot)2

Country

fingerprintco-occurrences
US · United States2

Network (ASN)

fingerprintco-occurrences
AS8075 · Microsoft Corporation2