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 2026-11-01 02:56 · JSON

Last 7 days (33 observations)

Distinct clients per day (last 30 days, peak 8/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
t13d311100_e8f1e7e78f70_d41ae481755e Match?Exact match in Thumbprint's published controlled catalog captures: rust-hyper 1.11.1, rust-hyper 1.12.0, rust-hyper 1.11.0, +1 more.The fingerprint page shows the full measured match list. More on the catalog.163
t13d1011h1_61a7ad8aa9b6_3a8073edd8ef12
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.1
t13d1812h1_85036bcba153_b26ce05bbdd61
t13d1717h2_5b57614c22b0_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 148.0.2, firefox 144.0.2, firefox 142.0.1, +6 more.The fingerprint page shows the full measured match list. More on the catalog.1
t13d2112h1_a5e33d19f158_d41ae481755e1
t13d3011h1_5fff68f6dbf7_a29327ec888c1
t13d1812h1_c62d0c81e055_d41ae481755e1
t13d1015h2_738be80a9c6b_598b4460cd971
t13d1011h2_a6d4a32d2996_b9003e5c3fb31

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr040000_177aea7101ae_000000000000_000000000000163
ge11nr06enus_85f58504866d_000000000000_0000000000007
he11nr06enus_85f58504866d_000000000000_0000000000004
ge11nn06enus_21ea1759749c_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
ge20nn11enus_3901d4197baf_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 153.0.1, +3 more.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 1.27.1, go-net/http 1.27.3, +14 more.The fingerprint page shows the full measured match list. More on the catalog.1
ge11nr07enus_9e32585f9ebf_000000000000_0000000000001
ge11nn06enus_85f58504866d_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:131072;5:16384|12517377|1:0:0:256|m,p,a,s1
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
4:47+17:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0126
4:48+16:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:015
4:53+11:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:011
4:46+18:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:06
4:45+19:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:05
4:55+9:0:1380:65535,13:mss,sok,ts,nop,ws:df,id+:05
4:53+11:0:1380:65535,13:mss,sok,ts,nop,ws:df,id+:05
4:47+17:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:02
4:50+14:0:1380:65535,13:mss,sok,ts,nop,ws:df,id+:02
6:55+9:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:02

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_7163
65535_2-4-8-1-3_1380_1312
64240_2-4-8-1-3_1460_102
64800_2-4-8-1-3_1440_72
32768_2-1-3-4-8_1460_102
65320_2-4-8-1-3_1420_71
62314_2-4-8-1-3_8902_121

Country

fingerprintco-occurrences
SG · Singapore168
US · United States6
SE · Sweden3
DE · Germany2
NL · Netherlands2
FI · Finland2
CN · China1

Network (ASN)

fingerprintco-occurrences
AS45102 · Alibaba (US) Technology Co., Ltd.163
AS13335 · Cloudflare, Inc.12
AS215125 · Church of Cyberology2
AS214379 · South Park Networks LLC2
AS205100 · F3 Netze e.V.2
AS396982 · Google LLC1
AS9808 · China Mobile Communications Group Co., Ltd.1
AS214503 · QuxLabs AB1

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.78
11ec,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 158.0.1, firefox 157.0, firefox 157.0.1, +5 more.The fingerprint page shows the full measured match list. More on the catalog.1