User-Agent

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:138.0) Gecko/20100101 Firefox/138.0

first seen 2026-08-01 04:38 · last seen 2026-08-16 04:14 · JSON

Decomposed attributes

Browser / clientFirefox 138.0
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
t13d251100_b78ed14e2fd0_ab7e3b40a6771
t13d251000_b78ed14e2fd0_e7c2852226511

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn050000_57c5e92682a8_000000000000_0000000000001
ge11nr050000_57c5e92682a8_000000000000_0000000000001

TCP SYN (p0f)

fingerprintco-occurrences
4:49+15:0:1436:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:49+15:0:1412:mss*46,7:mss,sok,ts,nop,ws:df,id+:01

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1436_71
64952_2-4-8-1-3_1412_71

Country

fingerprintco-occurrences
US · United States1
NL · Netherlands1

Network (ASN)

fingerprintco-occurrences
AS135377 · UCLOUD INFORMATION TECHNOLOGY (HK) LIMITED1
AS202412 · Omegatech LTD1