User-Agent

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:137.0) Gecko/20100101 Firefox/137.0

first seen 2026-06-18 14:59 · last seen 2026-09-02 09:28 · 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 137.0
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
t13d1011h1_61a7ad8aa9b6_3a8073edd8ef7
t13d1812h1_85036bcba153_b26ce05bbdd61
t13d2112h1_a5e33d19f158_d41ae481755e1
t13d3011h1_5fff68f6dbf7_a29327ec888c1
t13d1812h1_c62d0c81e055_d41ae481755e1
t13d1011h2_a6d4a32d2996_b9003e5c3fb31
t13d1015h2_738be80a9c6b_598b4460cd971
t13d1211h2_9ba0baadd8b7_9ced094328c91

HTTP request (JA4H)

fingerprintco-occurrences
he11nr06enus_85f58504866d_000000000000_0000000000004
ge11nn06enus_21ea1759749c_000000000000_0000000000003
ge11nr06enus_85f58504866d_000000000000_0000000000003
ge20nn04enus_989c7cc05c9b_000000000000_0000000000002
ge11nn040000_608e01151bf4_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog.1
ge20nn020000_b89ce445e0b3_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13, go-net/http 1.27.0, go-net/http 1.26.6, +10 more.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:6291456;6:262144|15663105|1:0:0:256|m,a,s,p1
1:65536;3:10000;4:6291456;5:16384;6:131072|6291456|1:0:0:256|s,a,p,m1
1:65536;2:0;4:6291456;6:262144;4:1048576|15663105|1:0:0:256|m,a,s,p1

TCP SYN (p0f)

fingerprintco-occurrences
4:53+11:0:1380:65535,13:mss,sok,ts,nop,ws:df,id+:05
6:55+9:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:02
4:55+9:0:1380:65535,13:mss,sok,ts,nop,ws:df,id+:02
4:106+22:0:1460:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+:01
4:50+14:0:1460:32768,10:mss,nop,ws,sok,ts::01
4:51+13:0:1460:32768,10:mss,nop,ws,sok,ts::01
4:53+11:0:8902:mss*7,12:mss,sok,ts,nop,ws:df,id+,ecn:01
4:47+17:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:01

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-4-8-1-3_1380_137
32768_2-1-3-4-8_1460_102
64800_2-4-8-1-3_1440_72
62314_2-4-8-1-3_8902_121
64240_2-4-8-1-3_1460_101

Country

fingerprintco-occurrences
US · United States5
SE · Sweden3
NL · Netherlands2
SG · Singapore2
DE · Germany1
CN · China1

Network (ASN)

fingerprintco-occurrences
AS13335 · Cloudflare, Inc.7
AS215125 · Church of Cyberology2
AS214379 · South Park Networks LLC2
AS9808 · China Mobile Communications Group Co., Ltd.1
AS214503 · QuxLabs AB1
AS205100 · F3 Netze e.V.1