User-Agent

Mozilla/5.0 (Windows NT 10.0; rv:121.0) Gecko/20100101 Firefox/121.0

first seen 2026-09-10 17:54 · last seen 2026-10-16 18:44 · JSON

Distinct clients per day (last 30 days, peak 1/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 121.0
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
t13d1715h2_5b57614c22b0_5c2c66f702b0 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 132.0.The fingerprint page shows the full measured match list. More on the catalog.1
t13d1712h1_ab0a1bf427ad_882d495ac3811
t13d1715h1_5b57614c22b0_5c2c66f702b01

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn04enus_39a3ba4480e8_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: urlsession 6.1.2.The fingerprint page shows the full measured match list. More on the catalog.1
ge11nn06enus_fb4afd1f380a_000000000000_0000000000001
ge11nn06enus_a89d28968959_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;4:4194304;5:1048576;6:10485760|1073741824|0|a,m,p,s Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.27.1, go-net/http 1.27.3, go-net/http 1.27.0, +1 more.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (p0f)

fingerprintco-occurrences
4:51+13:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:114+14:0:1460:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:01
4:51+13:0:1380:mss*47,7:mss,sok,ts,nop,ws:df,id+:01

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_71
64240_2-1-3-1-1-4_1460_81
64860_2-4-8-1-3_1380_71

Country

fingerprintco-occurrences
NL · Netherlands2
MY · Malaysia1

Network (ASN)

fingerprintco-occurrences
AS47674 · Net Solutions - Consultoria Em Tecnologias De Informacao, Sociedade Unipessoal LDA2
AS206216 · Advin Services LLC1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1, python-requests 2.34.2, curl 8.23.0, +4 more.The fingerprint page shows the full measured match list. More on the catalog.1