TCP SYN (p0f)

4:43+21:0:1440:mss*29,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-25 11:32 · last seen 2026-07-12 19:45 · JSON

Decomposed attributes

IP version4
Initial TTL43+21
Options length0
MSS1440
Window sizemss*29
Window scale7
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_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.5, go-net/http 1.26.4.The fingerprint page shows the full measured match list. More on the catalog.21

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr09enus_ac151016e6e5_000000000000_00000000000014
ge11nr06enus_34bb3a836f3b_000000000000_0000000000004
ge11nr06enus_a89d28968959_000000000000_0000000000003

TCP SYN (JA4T)

fingerprintco-occurrences
42340_2-4-8-1-3_1440_717

User-Agent

fingerprintco-occurrences
DuckDuckBot/1.1; (+http://duckduckgo.com/duckduckbot.html)21

Country

fingerprintco-occurrences
IE · Ireland18
US · United States3

Network (ASN)

fingerprintco-occurrences
AS8075 · Microsoft Corporation21