TCP SYN (p0f)

4:37+27:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-15 22:48 · last seen 2026-08-31 16:32 · 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 TTL37+27
Options length0
MSS1418
Window sizemss*44
Window scale9
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
t13d1712h2_5b57614c22b0_ef7df7f74e483
t13d1712h2_5b57614c22b0_d5fe2c511efa3

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn06enus_32386ca2063f_000000000000_0000000000006

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;1:4096;8:0;3:1024;4:1048576|25100289|0|a,p,m,s6

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1418_96

User-Agent

fingerprintco-occurrences
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ChatGPT-User/1.0; +https://openai.com/bot6

Country

fingerprintco-occurrences
CH · Switzerland3
DK · Denmark2
BR · Brazil1

Network (ASN)

fingerprintco-occurrences
AS8075 · Microsoft Corporation6