TCP SYN (p0f)

4:55+9:0:1420:mss*44,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-08-21 18:00 · last seen 2026-09-14 16:59 · JSON

Last 7 days (1 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 TTL55+9
Options length0
MSS1420
Window sizemss*44
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
t13d1515h1_8daaf6152771_de4a06bb82e32
t13d1515h1_8daaf6152771_0a20fe35d3a51
t13d131000_f57a46bbacb6_e7c285222651 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.23.12.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn13enus_9db22d02e17a_000000000000_0000000000002
ge11nn14enus_4a2973d235de_000000000000_0000000000001
ge11nr050000_22697fd0b6fe_000000000000_0000000000001

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1420_74

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.361
metabase-cve-2026-72898-detect/1.0 (benign detection probes only)1

Country

fingerprintco-occurrences
CH · Switzerland3
US · United States1

Network (ASN)

fingerprintco-occurrences
AS6730 · Sunrise GmbH3
AS22612 · Namecheap, Inc.1