TCP SYN (p0f)

4:58+6:0:1420:mss*31,9:mss,sok,ts,nop,ws:df,id+,ts2+:0

first seen 2026-08-28 20:23 · last seen 2026-09-14 05:16 · JSON

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

4:58+6:0:1420:mss*31,9:mss,sok,ts,nop,ws:df,id+,ts2+:0

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleW…

User-Agent claims Windows

TCP SYN initial TTL 58+6 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; compatible; LinkedInBot/1.0; +http://www.linkedin.com) Chrome/114.0.6420.45 Safari/537.36
Observed TTL	58+6 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-08-28

Decomposed attributes

IP version	`4`
Initial TTL	`58+6`
Options length	`0`
MSS	`1420`
Window size	`mss*31`
Window scale	`9`
Options layout	`mss,sok,ts,nop,ws`
Quirks	`df,id+,ts2+`
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)

fingerprint	co-occurrences
`t13d131300_f57a46bbacb6_1bd98dace775`	5
`t13d131200_f57a46bbacb6_9249cab70c77`	2

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn05enus_f3bb7aa45ec4_000000000000_000000000000`	3
`ge11nr05enus_f3bb7aa45ec4_000000000000_000000000000`	3
`ge11nn060000_6f1c3d56a901_000000000000_000000000000`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`43648_2-4-8-1-3_1420_9`	7

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ChatGPT-User/1.0; +https://openai.com/bot)`	1
`Mozilla/5.0 (Macintosh; Intel Mac OS X 14_6_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.5780.193 Safari/537.36; compatible; Claude-User/1.0; +https://www.anthropic.com/claude-user`	1
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko; compatible; LinkedInBot/1.0; +http://www.linkedin.com) Chrome/114.0.6420.45 Safari/537.36`	1
`Mozilla/5.0 (compatible; Claude-SearchBot/1.0; +https://www.anthropic.com/claude-searchbot)`	1
`Mozilla/5.0 (Linux; Android 15; SM-S918B) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.6850.59 Mobile Safari/537.36; compatible; TelegramBot/1.0`	1
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.4071.193 Safari/537.36 Edg/133.0.4071.193; compatible; Perplexity-User/1.0; +https://perplexity.ai/perplexity-user`	1
`Mozilla/5.0 (Macintosh; Intel Mac OS X 14.5; rv:132.13) Gecko/20100101 Firefox/132.13; compatible; Twitterbot/1.0`	1

Country

fingerprint	co-occurrences
`TW` · Taiwan	5
`US` · United States	2

Network (ASN)

fingerprint	co-occurrences
`AS396982` · Google LLC	7