User-Agent

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:121.0) Gecko/20100101 Firefox/121.0

first seen 2026-07-03 21:50 · last seen 2026-10-29 14:41 · JSON

Last 7 days (1 observations)

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
t13d1312h1_f57a46bbacb6_ab7e3b40a67711
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.4
t13d1515h2_8daaf6152771_de4a06bb82e31
t13d1011h2_61a7ad8aa9b6_3fcd1a44f3e3 Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.12.28.The fingerprint page shows the full measured match list. More on the catalog.1
t13d181100_85036bcba153_d41ae481755e1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr05enus_900748f1e0f3_000000000000_0000000000008
ge11nn05enus_900748f1e0f3_000000000000_0000000000002
ge11nr030000_cd680697de12_000000000000_0000000000001
ge11nn040000_e1d2031bdfea_000000000000_0000000000001
ge11nn050000_a1c329e38462_000000000000_0000000000001
ge11nr14enus_947cec626068_000000000000_0000000000001
po11nn120000_298f624ab032_000000000000_0000000000001
ge11nr09enus_5c90da8cf060_000000000000_0000000000001
ge20nr11enus_a617a738ecb1_000000000000_0000000000001
ge20nn05enus_8db26f4ec8f0_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;4:2097152;5:16384;6:16384|5177345|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.12.28, rust-reqwest 0.13.5, rust-reqwest 0.13.4, +4 more.The fingerprint page shows the full measured match list. More on the catalog.1
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 1.27.0, go-net/http 1.27.3, +1 more.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (p0f)

fingerprintco-occurrences
4:56+8:0:1460:mss*29,11:mss,sok,ts,nop,ws:df,id+:03
4:54+10:0:1460:mss*29,9:mss,sok,ts,nop,ws:df,id+:03
4:51+13:0:1460:mss*29,11:mss,sok,ts,nop,ws:df,id+:02
4:49+15:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:02
4:51+13:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:47+17:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:53+11:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:55+9:0:1460:mss*29,9:mss,sok,ts,nop,ws:df,id+:01
4:54+10:0:1460:mss*29,12:mss,sok,ts,nop,ws:df,id+:01
4:108+20:0:1440:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:01

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_75
42340_2-4-8-1-3_1460_115
42340_2-4-8-1-3_1460_94
42340_2-4-8-1-3_1460_122
64240_2-1-3-1-1-4_1440_81
65535_2-4-8-1-3_1460_121

Country

fingerprintco-occurrences
US · United States7
NL · Netherlands6
FR · France3
DE · Germany1
SE · Sweden1

Network (ASN)

fingerprintco-occurrences
AS48090 · TECHOFF SRV LIMITED6
AS142430 · DIGI VPS3
AS150303 · SoloRDP2
AS53514 · UHQ Services LLC2
AS8075 · Microsoft Corporation1
AS200373 · 3xK Tech GmbH1
AS8560 · IONOS SE1
AS3215 · Orange S.A.1
AS203861 · Miteflux Technologies Ltd1

TLS supported groups

fingerprintco-occurrences
001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, php-guzzle 8.3.1, curl 7.88.1, +10 more.The fingerprint page shows the full measured match list. More on the catalog.1
001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.12.28, rust-reqwest 0.11.27, powershell 7.6.8, +1 more.The fingerprint page shows the full measured match list. More on the catalog.1
0a0a,001d,0017,00181