TCP SYN (p0f)

4:42+22:0:1440:mss*29,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-09-23 14:48 · last seen 2026-10-27 11:16 · JSON

Last 7 days (1 observations)

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 TTL42+22
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.7

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr09enus_ac151016e6e5_000000000000_0000000000007

TCP SYN (JA4T)

fingerprintco-occurrences
42340_2-4-8-1-3_1440_77

User-Agent

fingerprintco-occurrences
DuckDuckBot/1.1; (+http://duckduckgo.com/duckduckbot.html)7

Country

fingerprintco-occurrences
IE · Ireland7

Network (ASN)

fingerprintco-occurrences
AS8075 · Microsoft Corporation7

TLS supported groups

fingerprintco-occurrences
11ec,11eb,11ed,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.27.3, go-net/http 1.26.10.The fingerprint page shows the full measured match list. More on the catalog.1