User-Agent
Mozilla/5.0 (X11; Linux x86_64; rv:149.0) Gecko/20100101 Firefox/149.0
first seen 2026-06-11 12:43 · last seen 2026-10-27 08:23 · JSON
Last 7 days (4 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 / client | Firefox 149.0 |
|---|---|
| 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 |
|---|---|
t13d1717h2_5b57614c22b0_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 148.0.2, firefox 144.0.2, firefox 142.0.1, +6 more.The fingerprint page shows the full measured match list. More on the catalog. | 28 |
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. | 10 |
t13d1716h2_5b57614c22b0_0c27189014cf Match?Exact match in Thumbprint's published controlled catalog captures: firefox 148.0.2, firefox 144.0.2, firefox 142.0.1, +6 more.The fingerprint page shows the full measured match list. More on the catalog. | 7 |
t13d1715h2_5b57614c22b0_132a2dbef2cc | 3 |
t13d131000_f57a46bbacb6_e7c285222651 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.23.12.The fingerprint page shows the full measured match list. More on the catalog. | 2 |
t13i130900_f57a46bbacb6_e7c285222651 | 1 |
t13d131300_f57a46bbacb6_1bd98dace775 | 1 |
t13d131200_f57a46bbacb6_9249cab70c77 | 1 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge20nn11zhcn_3901d4197baf_000000000000_000000000000 | 13 |
ge20nr10zhcn_b3034183f430_000000000000_000000000000 | 8 |
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. | 4 |
ge20nr11cs00_187a9385d229_000000000000_000000000000 | 4 |
ge11nn05enus_813e32c09d15_000000000000_000000000000 | 3 |
ge20nr11enus_3901d4197baf_000000000000_000000000000 | 3 |
ge20nn12zhcn_3b263d8a4b60_000000000000_000000000000 | 2 |
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. | 2 |
ge30nr11enus_c87d53636918_000000000000_000000000000 | 2 |
ge30nr10enus_9fcbd3f1e2d6_000000000000_000000000000 | 2 |
HTTP/2 frames (Akamai)
| fingerprint | co-occurrences |
|---|---|
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. | 18 |
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|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. | 2 |
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. | 2 |
1:65536;2:0;4:131072;5:16384|12517377|9:0:0:22|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|5:0:0:42|m,p,a,s | 1 |
TCP SYN (p0f)
TCP SYN (JA4T)
| fingerprint | co-occurrences |
|---|---|
64240_2-4-8-1-3_1460_7 | 25 |
64240_2-4-8-1-3_1360_10 | 5 |
64240_2-4-8-1-3_1379_10 | 3 |
64240_2-4-8-1-3_1452_7 | 2 |
43200_2-4-8-1-3_1440_9 | 1 |
42600_2-4-8-1-3_1420_9 | 1 |
QUIC transport params
| fingerprint | co-occurrences |
|---|---|
q12_022106b74856 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 154.0, +29 more.The fingerprint page shows the full measured match list. More on the catalog. | 10 |
Country
| fingerprint | co-occurrences |
|---|---|
HK · Hong Kong SAR China | 14 |
DE · Germany | 12 |
CZ · Czechia | 11 |
CN · China | 9 |
US · United States | 4 |
AU · Australia | 2 |
BE · Belgium | 1 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS136907 · HUAWEI CLOUDS | 14 |
AS47583 · Hostinger International Limited | 12 |
AS55990 · Huawei Cloud Service data center | 9 |
AS29208 · Quantcom, a.s. | 6 |
AS24971 · MasterDC s.r.o. | 5 |
AS22295 · Advin Services LLC | 4 |
AS10143 · Exetel Pty Ltd | 2 |
AS396982 · Google LLC | 1 |
TLS supported groups
| fingerprint | co-occurrences |
|---|---|
11ec,001d,0017,0018,0019,0100,0101 | 5 |
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 |
t13d1716h2_5b57614c22b0_0c27189014cf | 2 |
t13d1715h2_5b57614c22b0_132a2dbef2cc | 1 |