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 2026-09-16 11:18 · JSON

Last 7 days (11 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_dc5437974b47 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 154.0, +18 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 154.0, firefox 154.0.1, firefox 155.0.1, +1 more.The fingerprint page shows the full measured match list. More on the catalog.3
q13d0315h3_55b375c5d22e_78345df32b3a2
t13d1516h2_8daaf6152771_0c27189014cf Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 155.0.1, firefox 154.0.1.The fingerprint page shows the full measured match list. More on the catalog.1
t13d1517h2_8daaf6152771_3e9721a6796e1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr11ru00_187a9385d229_000000000000_0000000000002
ge30nn12engb_35ca41c56357_000000000000_0000000000001
ge30nr11engb_c601de5755fc_000000000000_0000000000001
ge20nr12engb_979a40433f82_000000000000_0000000000001
ge20nn12ru00_a72b71f519fc_000000000000_0000000000001
ge30nr10ru00_d6360b5be5ba_000000000000_0000000000001
ge30nr12ru00_120f168c5544_000000000000_0000000000001
ge30nr09enus_a060b6642c5e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 154.0, +22 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 154.0, +21 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 152.0.6, +18 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;4:131072;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 154.0, +25 more.The fingerprint page shows the full measured match list. More on the catalog.4
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
4:53+11:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:03
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

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_103
64800_2-4-8-1-3_1440_71
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 155.0.The fingerprint page shows the full measured match list. More on the catalog.6

Country

fingerprintco-occurrences
RU · Russia5
GB · United Kingdom3
PT · Portugal3

Network (ASN)

fingerprintco-occurrences
AS42610 · OJSC National Cable Networks5
AS20712 · Andrews & Arnold Ltd3
AS12353 · Vodafone Portugal3

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
t13d1516h2_8daaf6152771_0c27189014cf1
q13d0315h3_55b375c5d22e_78345df32b3a1
t13d1517h2_8daaf6152771_3e9721a6796e1