User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:157.0) Gecko/20100101 Firefox/157.0
first seen 2026-10-03 02:34 · last seen 2026-10-19 20:08 · JSON
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 157.0 |
|---|---|
| Operating system | macOS 10.15 |
| 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_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. | 32 |
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 |
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. | 4 |
t13d391200_5eb3916e6b4a_7e1102d2036b | 1 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge20nr11enus_3901d4197baf_000000000000_000000000000 | 21 |
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 |
ge20nr11enca_1d88e8a431b9_000000000000_000000000000 | 4 |
ge20nn11enus_3901d4197baf_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 153.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog. | 3 |
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. | 2 |
ge30nr11enus_72d60872bf6a_000000000000_000000000000 | 1 |
ge20nr12enus_1204b4dfdccd_000000000000_000000000000 | 1 |
ge30nn11de00_c87d53636918_000000000000_000000000000 | 1 |
ge20nn12enca_7e62679e718a_000000000000_000000000000 | 1 |
ge30nr11enus_99c7f5f3cb0b_000000000000_000000000000 | 1 |
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. | 5 |
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|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|11:0:0:42|m,p,a,s | 2 |
1:65536;2:0;4:131072;5:16384|12517377|13:0:0:42|m,p,a,s | 2 |
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|23:0:0:42|m,p,a,s | 2 |
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|15:0:0:42|m,p,a,s | 1 |
TCP SYN (p0f)
TCP SYN (JA4T)
| fingerprint | co-occurrences |
|---|---|
65535_2-1-3-1-1-8-4-0-0_1220_6 | 24 |
65535_2-4-8-1-3_1460_9 | 7 |
65535_2-1-3-1-1-8-4-0-0_1440_6 | 5 |
65535_2-1-3-1-1-8-4-0-0_1390_6 | 1 |
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. | 4 |
Country
| fingerprint | co-occurrences |
|---|---|
NO · Norway | 24 |
US · United States | 6 |
CA · Canada | 5 |
BR · Brazil | 3 |
DE · Germany | 2 |
PT · Portugal | 1 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS50304 · Blix Solutions AS | 24 |
AS212238 · Datacamp Limited | 6 |
AS5769 · Videotron Ltee | 5 |
AS26599 · TELEFÔNICA BRASIL S.A | 3 |
AS13335 · Cloudflare, Inc. | 2 |
AS207990 · HostRoyale Technologies Pvt Ltd | 1 |
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. | 2 |
001d,0017,0018,0019,001e,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: java-httpclient 17.0.19, java-httpclient 11.0.31.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).
| fingerprint | linked observations |
|---|---|
q13d0315h3_55b375c5d22e_dc5437974b47 | 1 |
t13d1516h2_8daaf6152771_0c27189014cf | 1 |