User-Agent
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:158.0) Gecko/20100101 Firefox/158.0
first seen 2026-10-15 17:27 · last seen 2026-10-29 11:34 · JSON
Last 7 days (10 observations)
Distinct clients per day (last 30 days, peak 3/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 / client | Firefox 158.0 |
|---|---|
| Operating system | Windows 10.0 |
| Device class | desktop |
| Note | inferred 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)
| fingerprint | co-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. | 13 |
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. | 8 |
t13d1515h2_8daaf6152771_a54fffd0eb61 | 8 |
t13d0916h2_f91f431d341e_0c27189014cf | 3 |
t13d0917h2_f91f431d341e_3cbfd9057e0d | 3 |
t13d1517h2_8daaf6152771_6f4c3a25c801 | 3 |
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. | 2 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge20nr12enus_979a40433f82_000000000000_000000000000 | 8 |
ge20nr13enus_016d87568c43_000000000000_000000000000 | 5 |
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. | 5 |
ge20nr12engb_5028d631abb0_000000000000_000000000000 | 4 |
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. | 3 |
ge30nr11enus_c87d53636918_000000000000_000000000000 | 3 |
ge20nn11enus_187a9385d229_000000000000_000000000000 | 2 |
ge20nn12enus_a72b71f519fc_000000000000_000000000000 | 1 |
ge20nn13enus_016d87568c43_000000000000_000000000000 | 1 |
ge30nn09enus_3456ae554dd0_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 152.0.3, firefox 152.0.1, firefox-esr 140.16.0esr, +7 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
HTTP/2 frames (Akamai)
| fingerprint | co-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. | 13 |
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. | 7 |
1:65536;2:0;4:131072;5:16384|12517377|5:0:0:42|m,p,a,s | 2 |
1:65536;2:0;4:131072;5:16384|12517377|9:0:0:42|m,p,a,s | 1 |
1:65536;2:0;4:131072;5:16384|12517377|5:0:0:22|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0.3, firefox 154.0, firefox 153.0, +12 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
1:65536;2:0;4:131072;5:16384|12517377|7:0:0:22|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0.3, firefox 155.0, firefox 154.0, +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|11:0:0:42|m,p,a,s | 1 |
1:65536;2:0;4:131072;5:16384|12517377|7:0:0:42|m,p,a,s | 1 |
TCP SYN (p0f)
TCP SYN (JA4T)
QUIC transport params
| fingerprint | co-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. | 13 |
Country
| fingerprint | co-occurrences |
|---|---|
NL · Netherlands | 12 |
US · United States | 8 |
DE · Germany | 7 |
FR · France | 6 |
BR · Brazil | 4 |
RO · Romania | 3 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS1136 · KPN B.V. | 9 |
AS54801 · Zillion Network Inc. | 8 |
AS3209 · Vodafone GmbH | 7 |
AS15557 · Societe Francaise Du Radiotelephone - SFR SA | 6 |
AS18881 · TELEFÔNICA BRASIL S.A | 4 |
AS12302 · Vodafone Romania S.A. | 3 |
AS64289 · Macarne.com | 3 |
TLS supported groups
| fingerprint | co-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. | 37 |
11ec,001d,0017,0018,0019,0202 | 3 |
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).
| fingerprint | linked observations |
|---|---|
q13d0315h3_55b375c5d22e_dc5437974b47 | 3 |
t13d1516h2_8daaf6152771_0c27189014cf | 2 |
t13d1517h2_8daaf6152771_3cbfd9057e0d | 1 |