TCP SYN (p0f)

4:43+21:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-18 07:28 · last seen 2026-09-14 13:54 · JSON

Last 7 days (3 observations)

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 TTL43+21
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_ef7df7f74e4816
t13d1713h2_5b57614c22b0_02c8e53ee3989
t13d1712h2_5b57614c22b0_d5fe2c511efa1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn06enus_32386ca2063f_000000000000_00000000000018
ge20nn07enus_bba0b359f971_000000000000_0000000000008

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;1:4096;8:0;3:1024;4:1048576|25100289|0|a,p,m,s26

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1418_918

User-Agent

fingerprintco-occurrences
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ChatGPT-User/1.0; +https://openai.com/bot26

Country

fingerprintco-occurrences
BE · Belgium7
ES · Spain6
CH · Switzerland3
PL · Poland3
SG · Singapore2
US · United States2
KR · South Korea2
NL · Netherlands1

Network (ASN)

fingerprintco-occurrences
AS8075 · Microsoft Corporation26