User-Agent
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:156.0) Gecko/20100101 Firefox/156.0
first seen 2026-09-16 18:42 · last seen 2026-09-17 15:53 · JSON
Last 7 days (30 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 156.0 |
|---|---|
| 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 |
|---|---|
t13d1617h2_46e7e9700bed_3cbfd9057e0d | 23 |
t13d1615h2_46e7e9700bed_a54fffd0eb61 | 5 |
t13d1517h2_8daaf6152771_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 154.0.1, firefox 155.0.1, +1 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
t13d2013h2_a09f3c656075_7f0f34a4126d Match?Exact match in Thumbprint's published controlled catalog captures: safari 26.5.2, safari 26.4, safari 26.6.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog. | 1 |
HTTP request (JA4H)
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 154.0, +25 more.The fingerprint page shows the full measured match list. More on the catalog. | 6 |
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|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, +8 more.The fingerprint page shows the full measured match list. More on the catalog. | 3 |
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. | 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|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|17:0:0:42|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)
| fingerprint | co-occurrences |
|---|---|
4:114+14:0:1412:65535,8:mss,nop,ws,nop,nop,sok:df,id+:0 | 28 |
4:52+12:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0 | 1 |
6:54+10:0:1295:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:flow:0 | 1 |
TCP SYN (JA4T)
| fingerprint | co-occurrences |
|---|---|
65535_2-1-3-1-1-4_1412_8 | 28 |
64240_2-4-8-1-3_1460_7 | 1 |
65535_2-1-3-1-1-8-4-0-0_1295_6 | 1 |
Country
| fingerprint | co-occurrences |
|---|---|
DE · Germany | 28 |
RU · Russia | 1 |
FI · Finland | 1 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS8881 · 1&1 Versatel GmbH | 28 |
AS12389 · PJSC Rostelecom | 1 |
AS50053 · VDSka hosting | 1 |