User-Agent

Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:157.0) Gecko/20100101 Firefox/157.0

first seen 2026-10-07 10:08 · last seen 2026-10-20 09:46 · JSON

Distinct clients per day (last 30 days, peak 2/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 157.0
Operating systemLinux x86_64
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
q13d0315h3_55b375c5d22e_dc5437974b47 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 155.0.1, +25 more.The fingerprint page shows the full measured match list. More on the catalog.7
t13d1516h2_8daaf6152771_0c27189014cf Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 155.0.1, firefox 155.0, +4 more.The fingerprint page shows the full measured match list. More on the catalog.3
t13d1617h1_86a278354501_3cbfd9057e0d2
t13d1517h2_8daaf6152771_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 155.0.1, firefox 154.0, firefox 156.0, +7 more.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP request (JA4H)

fingerprintco-occurrences
ge30nr11enus_0c72cb6d0dd2_000000000000_0000000000001
ge20nr11enus_3901d4197baf_000000000000_0000000000001
ge30nr09enus_a060b6642c5e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 155.0.1, +28 more.The fingerprint page shows the full measured match list. More on the catalog.1
ge20nr10enus_b3034183f430_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 155.0.1, +27 more.The fingerprint page shows the full measured match list. More on the catalog.1
ge30nn10enus_9fcbd3f1e2d6_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 155.0.1, +24 more.The fingerprint page shows the full measured match list. More on the catalog.1
ge30nr11enus_c87d53636918_000000000000_0000000000001
ge11nn12enus_9a9494a1019e_000000000000_0000000000001
ge20nr11enus_1d88e8a431b9_000000000000_0000000000001
ge30nr10enus_432609af9ecc_000000000000_0000000000001
ge30nn11de00_7eaa533deebc_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:131072;5:16384|12517377|3:0:0:22|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 155.0.1, +31 more.The fingerprint page shows the full measured match list. More on the catalog.3
1:65536;2:0;4:131072;5:16384|12517377|3:0:0:42|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 152.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (p0f)

fingerprintco-occurrences
4:52+12:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:01
4:50+14:0:1452:mss*45,10:mss,sok,ts,nop,ws:df,id+:01
4:44+20:0:1452:65535,6:mss,sok,ts,nop,ws:df,id+:01
4:241+14:0:1452:65535,6:mss,sok,ts,nop,ws:df,id+:01
4:50+14:0:1382:mss*44,10:mss,sok,ts,nop,ws:df,id+:01
4:44+20:0:1340:mtu*47,10:mss,sok,ts,nop,ws:df,id+:01

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-4-8-1-3_1452_62
64240_2-4-8-1-3_1460_101
65340_2-4-8-1-3_1452_101
64240_2-4-8-1-3_1382_101
64860_2-4-8-1-3_1340_101

QUIC transport params

fingerprintco-occurrences
q13_c3e7031b10dc Match?Exact match in Thumbprint's published controlled catalog captures: firefox 155.0.1, firefox 156.0, firefox 155.0, +5 more.The fingerprint page shows the full measured match list. More on the catalog.7

Country

fingerprintco-occurrences
FI · Finland4
ES · Spain3
DE · Germany2
US · United States2
ID · Indonesia2

Network (ASN)

fingerprintco-occurrences
AS51765 · Oy Creanova Hosting Solutions Ltd.4
AS3352 · TELEFONICA DE ESPANA S.A.U.3
AS3320 · Deutsche Telekom AG2
AS7713 · PT Telekomunikasi Indonesia2
AS701 · Verizon Business1
AS5719 · State University of New York at Stony Brook1

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.3
11ec,001d,0017,0018,0019,0100,01012

Cross-transport links

TLS ClientHello fingerprints observed from the same client via the beacon's correlation id on the other transport (e.g. this stack over TCP ↔ that stack over QUIC).

fingerprintlinked observations
q13d0315h3_55b375c5d22e_dc5437974b472
t13d1516h2_8daaf6152771_0c27189014cf1
t13d1517h2_8daaf6152771_3cbfd9057e0d1