User-Agent

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:123.0) Gecko/20100101 Firefox/123.0

first seen 2026-08-27 03:09 · last seen 2026-10-31 03:42 · JSON

Last 7 days (90 observations)

Distinct clients per day (last 30 days, peak 68/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

Browser / clientFirefox 123.0
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
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.89
t12d130600_2d7513195f68_e51b7354d87f1
t13d1412h1_cbb2034c60b8_e5728521abd41

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr16frfr_3dfdba18536b_000000000000_00000000000015
ge11nr16engb_3dfdba18536b_000000000000_00000000000013
ge11nr16zhtw_3dfdba18536b_000000000000_00000000000013
ge11nr15dede_944d72baa157_000000000000_00000000000010
ge11nr16dede_3dfdba18536b_000000000000_0000000000007
ge11nr16zhcn_3dfdba18536b_000000000000_0000000000007
ge11nr15zhcn_944d72baa157_000000000000_0000000000007
ge11nr16enus_3dfdba18536b_000000000000_0000000000005
ge11nr15zhtw_944d72baa157_000000000000_0000000000004
ge11nr15frfr_944d72baa157_000000000000_0000000000003

TCP SYN (p0f)

fingerprintco-occurrences
4:50+14:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:02
4:47+17:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:02
4:46+18:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:02
4:47+17:0:1440:mss*44,7:mss,sok,ts,nop,ws:df,id+:02
4:55+9:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:02
4:47+17:0:1452:65535,6:mss,sok,ts,nop,ws:df,id+:02
4:51+13:0:1452:mss*44,7:mss,sok,ts,nop,ws:df,id+:02
4:47+17:0:1400:mss*44,7:mss,sok,ts,nop,ws:df,id+:02
4:47+17:0:1460:65535,8:mss,sok,ts,nop,ws:df,id+:02
4:44+20:0:1440:65535,6:mss,sok,ts,nop,ws:df,id+:02

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_711
65535_2-4-8-1-3_1452_67
65535_2-4-8-1-3_1460_66
65535_2-4-8-1-3_1412_66
65535_2-4-8-1-3_1460_86
65535_2-4-8-1-3_1440_66
65535_2-4-8-1-3_1412_85
64240_2-4-8-1-3_1452_75
65535_2-4-8-1-3_1440_84
65535_2-4-8-1-3_1400_104

Country

fingerprintco-occurrences
BR · Brazil20
CO · Colombia8
AR · Argentina7
MX · Mexico6
BD · Bangladesh5
PK · Pakistan5
UA · Ukraine4
VE · Venezuela4
IL · Israel3
MA · Morocco3

Network (ASN)

fingerprintco-occurrences
AS28573 · Claro NXT Telecomunicacoes Ltda3
AS26599 · TELEFÔNICA BRASIL S.A3
AS36903 · Office National des Postes et Telecommunications ONPT (Maroc Telecom) / IAM2
AS27699 · TELEFÔNICA BRASIL S.A2
AS10620 · Telmex Colombia S.A.2
AS8151 · Uninet S.A. de C.V.2
AS27747 · Telecentro S.A.2
AS59257 · CMPak Limited2
AS271791 · CABLE NORTE CA.2
AS48090 · TECHOFF SRV LIMITED1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 157.0.1, firefox-esr 153.5.1esr, firefox 158.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.89
001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13.The fingerprint page shows the full measured match list. More on the catalog.1