User-Agent
Mozilla/5.0 (X11; Linux x86_64; rv:158.0) Gecko/20100101 Firefox/158.0
first seen 2026-10-19 20:09 · last seen 2026-10-30 22:20 · JSON
Last 7 days (6 observations)
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 / client | Firefox 158.0 |
|---|---|
| Operating system | Linux x86_64 |
| 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 |
|---|---|
t13d1517h2_8daaf6152771_6f4c3a25c801 | 25 |
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. | 5 |
t13d1516h2_8daaf6152771_14f25f0c9e96 | 5 |
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 |
|---|---|
ge20nr13enus_52a9a314672a_000000000000_000000000000 | 22 |
ge20nn10enus_b3034183f430_000000000000_000000000000 | 4 |
ge30nr10enus_d6360b5be5ba_000000000000_000000000000 | 2 |
ge20nr11enus_187a9385d229_000000000000_000000000000 | 2 |
ge20nn09enus_bfc092dff6c6_000000000000_000000000000 | 2 |
ge30nn11enus_7eaa533deebc_000000000000_000000000000 | 1 |
ge30nr11enus_7eaa533deebc_000000000000_000000000000 | 1 |
ge20nn12enus_a72b71f519fc_000000000000_000000000000 | 1 |
ge20nn10enus_d353d425b0bb_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 152.0.1.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
ge30nr12enus_120f168c5544_000000000000_000000000000 | 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. | 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. | 3 |
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|17:0:0:42|m,p,a,s | 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|13:0:0:42|m,p,a,s | 1 |
1:65536;2:0;4:131072;5:16384|12517377|15:0:0:42|m,p,a,s | 1 |
1:65536;2:0;4:131072;5:16384|12517377|19:0:0:42|m,p,a,s | 1 |
TCP SYN (p0f)
TCP SYN (JA4T)
| fingerprint | co-occurrences |
|---|---|
64860_2-4-8-1-3_1380_10 | 25 |
64240_2-4-8-1-3_1412_10 | 5 |
64240_2-4-8-1-3_1460_10 | 2 |
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. | 5 |
Country
| fingerprint | co-occurrences |
|---|---|
PL · Poland | 26 |
US · United States | 6 |
IT · Italy | 5 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS16276 · OVH SAS | 26 |
AS12874 · Fastweb SpA | 5 |
AS11878 · tzulo, inc. | 4 |
AS7922 · Comcast Cable Communications, LLC | 2 |
TLS supported groups
| fingerprint | co-occurrences |
|---|---|
11ec,001d,0017,0018,0019,0202 | 35 |
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. | 2 |
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_bb76f32061e3 | 2 |
t13d1516h2_8daaf6152771_14f25f0c9e96 | 2 |