User-Agent

Mozilla/5.0 (X11; Linux x86_64; rv:155.0) Gecko/20100101 Firefox/155.0

first seen 2026-09-05 21:02 · last seen 2026-10-24 22:48 · 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 155.0
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_78345df32b3a5
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.4
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.4
q13d0315h3_55b375c5d22e_bb76f32061e3 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 156.0, firefox 156.0.1.The fingerprint page shows the full measured match list. More on the catalog.1
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.1
t13d1516h2_8daaf6152771_fe7c3632a08d1
t13d1517h2_8daaf6152771_3e9721a6796e1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr11ru00_187a9385d229_000000000000_0000000000002
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
ge30nr10enus_9fcbd3f1e2d6_000000000000_0000000000001
ge30nr11enus_72d60872bf6a_000000000000_0000000000001
ge20nr12enus_1204b4dfdccd_000000000000_0000000000001
ge30nr12enus_c32155934b7e_000000000000_0000000000001
ge30nn12engb_35ca41c56357_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.5
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
1:65536;2:0;4:131072;5:16384|12517377|1:0:0:42|m,p,a,s1

TCP SYN (p0f)

fingerprintco-occurrences
4:53+11:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:03
4:45+19:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
6:50+14:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:01
6:44+20:0:1392:mss*45,10:mss,sok,ts,nop,ws:flow:01
4:55+9:0:1452:mss*44,10:mss,sok,ts,nop,ws:df,id+:01

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_103
64240_2-4-8-1-3_1460_71
64800_2-4-8-1-3_1440_71
64240_2-4-8-1-3_1452_101
64800_2-4-8-1-3_1392_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.10

Country

fingerprintco-occurrences
RU · Russia5
DE · Germany4
GB · United Kingdom3
PT · Portugal3
AU · Australia1
EC · Ecuador1

Network (ASN)

fingerprintco-occurrences
AS42610 · OJSC National Cable Networks5
AS3320 · Deutsche Telekom AG4
AS20712 · Andrews & Arnold Ltd3
AS12353 · Vodafone Portugal3
AS38195 · Superloop1
AS27947 · Telconet S.A1

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.1

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_dc5437974b473
t13d1517h2_8daaf6152771_3cbfd9057e0d2
q13d0315h3_55b375c5d22e_78345df32b3a2
t13d1516h2_8daaf6152771_0c27189014cf1
t13d1516h2_8daaf6152771_fe7c3632a08d1
t13d1517h2_8daaf6152771_3e9721a6796e1