User-Agent

Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0

first seen 2026-09-25 18:25 · last seen 2026-09-28 01:23 · JSON

Decomposed attributes

Browser / clientFirefox 121.0
Operating systemLinux x86_64
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
t13d1312h1_f57a46bbacb6_ab7e3b40a6773

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr10enus_22dfab91f71a_000000000000_0000000000001
ge11nr15enus_4483acc537c0_000000000000_0000000000001
ge11nr17enus_85506d391b22_000000000000_0000000000001

TCP SYN (p0f)

fingerprintco-occurrences
4:51+13:0:1460:mss*29,11:mss,sok,ts,nop,ws:df,id+:02
4:51+13:0:1460:mss*29,9:mss,sok,ts,nop,ws:df,id+:01

TCP SYN (JA4T)

fingerprintco-occurrences
42340_2-4-8-1-3_1460_112
42340_2-4-8-1-3_1460_91

Country

fingerprintco-occurrences
NL · Netherlands3

Network (ASN)

fingerprintco-occurrences
AS48090 · TECHOFF SRV LIMITED3