User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:158.0) Gecko/20100101 Firefox/158.0
first seen 2026-10-14 03:14 · last seen 2026-10-26 17:01 · JSON
Last 7 days (11 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 | 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 |
|---|---|
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 |
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 |
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. | 2 |
t13d1515h2_8daaf6152771_a54fffd0eb61 | 1 |
t13d4907h1_0d8feac7bc37_7395dae3b2f3 | 1 |
t13d1517h1_8daaf6152771_3cbfd9057e0d | 1 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge20nr12enus_979a40433f82_000000000000_000000000000 | 3 |
ge30nr12engb_120f168c5544_000000000000_000000000000 | 3 |
ge30nr10engb_d6360b5be5ba_000000000000_000000000000 | 2 |
ge20nr11engb_187a9385d229_000000000000_000000000000 | 2 |
ge11nn13enus_774025d249a8_000000000000_000000000000 | 2 |
ge30nr11enus_7eaa533deebc_000000000000_000000000000 | 1 |
ge30nr10enus_d6360b5be5ba_000000000000_000000000000 | 1 |
ge20nr11enus_187a9385d229_000000000000_000000000000 | 1 |
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. | 1 |
ge30nr12enus_35ca41c56357_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. | 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 |
TCP SYN (p0f)
TCP SYN (JA4T)
| fingerprint | co-occurrences |
|---|---|
65535_2-1-3-1-1-8-4-0-0_1460_6 | 3 |
65535_2-4-8-1-3_1360_13 | 2 |
65535_2-1-3-1-1-8-4-0-0_1452_6 | 2 |
65535_2-4-8-1-3_1460_9 | 1 |
65535_2-1-3-1-1-8-4-0-0_1220_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. | 13 |
Country
| fingerprint | co-occurrences |
|---|---|
US · United States | 11 |
GB · United Kingdom | 10 |
CH · Switzerland | 1 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS13037 · Zen Internet Ltd | 10 |
AS12271 · Charter Communications Inc | 6 |
AS147049 · PacketHub S.A. | 3 |
AS13335 · Cloudflare, Inc. | 2 |
AS51852 · Private Layer INC | 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. | 18 |
001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13.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 | 4 |
t13d1516h2_8daaf6152771_0c27189014cf | 2 |
t13d1517h2_8daaf6152771_3cbfd9057e0d | 1 |
t13d1515h2_8daaf6152771_a54fffd0eb61 | 1 |