User-Agent

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:137.1) Gecko/20100101 Firefox/137.1

first seen 2026-09-23 05:34 · last seen 2026-09-23 05:34 · JSON

Decomposed attributes

Browser / clientFirefox 137.1
Operating systemWindows 10.0
Device classdesktop
Noteinferred from the self-declared string — a claim, not a measurement; compare with the wire fingerprints above

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
t13d1717h2_5b57614c22b0_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 148.0.2, firefox 144.0.2, firefox 142.0.1, +6 more.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn11enus_3901d4197baf_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 153.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:131072;5:16384|12517377|1:0:0:42|m,p,a,s1

TCP SYN (p0f)

fingerprintco-occurrences
4:55+9:0:1460:32768,10:mss,nop,ws,sok,ts::01

TCP SYN (JA4T)

fingerprintco-occurrences
32768_2-1-3-4-8_1460_101

Country

fingerprintco-occurrences
NL · Netherlands1

Network (ASN)

fingerprintco-occurrences
AS215125 · Church of Cyberology1