TCP SYN (p0f)
4:46+18:0:1440:mss*44,10:mss,sok,ts,nop,ws:df,id+:0
first seen 2026-06-12 06:58 · last seen 2026-09-10 23:29 · JSON
Matches controlled captures
Known clients driven through this site's own edge produced this exact fingerprint — measured truth, not inference. catalog →
firefox 153.0.3 · Ubuntu 24.04 · via geckodriver · ci — 1 session, last 2026-08-18 12:26 controlled chrome 151.0.7922.108 · Ubuntu 24.04 · via chromedriver · ci — 1 session, last 2026-08-18 12:25 controlled firefox 152.0.6 · Ubuntu 24.04 · via geckodriver · ci — 1 session, last 2026-07-27 21:05 controlled chrome 150.0.7871.128 · Ubuntu 24.04 · via chromedriver · ci — 1 session, last 2026-07-27 21:05 controlled chrome 150.0.7871.46 · Ubuntu 24.04 · ci — 1 session, last 2026-07-13 20:53 controlled firefox 152.0.3 · Ubuntu 24.04 · ci — 1 session, last 2026-07-01 01:00 controlled chrome 149.0.7827.200 · Ubuntu 24.04 · ci — 1 session, last 2026-07-01 00:59 controlled chrome 149.0.7827.155 · Ubuntu 24.04 · ci — 1 session, last 2026-06-25 22:44 controlled firefox 151.0.3 · Ubuntu 24.04 · ci — 1 session, last 2026-06-12 06:58 controlled chrome 149.0.7827.53 · Ubuntu 24.04 · ci — 1 session, last 2026-06-12 06:58 controlled
TCP SYN signatures from container or CI runners reflect the capture environment's kernel and network path, not the named client — the layers above (TLS, HTTP/2, HTTP) are the client's own.
Inconsistencies
User-Agents observed with this fingerprint that contradict what it proves at the wire. all inconsistencies →
fingerprint User-Agent claims wire shows confidence seen first seen last seen
4:46+18:0:1440:mss*44,10:mss,sok,ts,nop,ws:df,id+:0Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleW… User-Agent claims Windows
TCP SYN initial TTL 46+18 indicates Unix-like The initial TTL is set by the sending kernel (64 on Unix-like systems, 128 on Windows) and survives NAT. But VPNs, proxies and tunnels legitimately replace the sending stack, so this check never exceeds medium confidence.
Full User-Agent Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36 Observed TTL 46+18 (observed + path distance → initial) Claimed OS Windows Confidence low — single sighting of an environmental signal
low 1
2026-07-01
2026-07-01
4:46+18:0:1440:mss*44,10:mss,sok,ts,nop,ws:df,id+:0Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:126… User-Agent claims Windows
TCP SYN initial TTL 46+18 indicates Unix-like The initial TTL is set by the sending kernel (64 on Unix-like systems, 128 on Windows) and survives NAT. But VPNs, proxies and tunnels legitimately replace the sending stack, so this check never exceeds medium confidence.
Full User-Agent Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:126.0) Gecko/20100101 Firefox/126.0 Observed TTL 46+18 (observed + path distance → initial) Claimed OS Windows Confidence low — single sighting of an environmental signal
low 1
2026-07-01
2026-07-01
Last 7 days (2 observations)
Distinct clients per day (last 30 days, peak 7/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
IP version 4Initial TTL 46+18Options length 0MSS 1440Window size mss*44Window scale 10Options layout mss,sok,ts,nop,wsQuirks df,id+Payload class 0
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)
HTTP request (JA4H)
HTTP/2 frames (Akamai)
fingerprint co-occurrences
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:220|m,a,s,pMatch? Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chromium 149.0.7827.102, chrome 149.0.7827.102, +59 more . The fingerprint page shows the full measured match list. More on the catalog. 21 1:65536;2:0;4:6291456;6:262144|15663105|5:1:0:220|m,a,s,pMatch? Exact match in Thumbprint's published controlled catalog captures: chromium 133.0.6943.16, chrome 150.0.7871.128, chromium 148.0.7778.96, +2 more . The fingerprint page shows the full measured match list. More on the catalog. 1 1:65536;2:0;4:6291456;6:262144|15663105|3:1:1:220|m,a,s,pMatch? Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.128, chrome 150.0.7871.115, chrome 151.0.7922.174, +7 more . The fingerprint page shows the full measured match list. More on the catalog. 1
TCP SYN (JA4T)
User-Agent
Country
fingerprint co-occurrences
US· United States 29
Network (ASN)
fingerprint co-occurrences
AS8075· Microsoft Corporation 29