TCP SYN (p0f)

4:48+16:0:1448:65535,6:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-25 09:26 · last seen 2026-09-26 18:45 · 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

4:48+16:0:1448:65535,6:mss,sok,ts,nop,ws:df,id+:0

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

User-Agent claims Windows

TCP SYN initial TTL 48+16 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/74.0.3729.169 Safari/537.36
Observed TTL	48+16 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-07-26

4:48+16:0:1448:65535,6:mss,sok,ts,nop,ws:df,id+:0

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

User-Agent claims Windows

TCP SYN initial TTL 48+16 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36
Observed TTL	48+16 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-08-21

4:48+16:0:1448:65535,6:mss,sok,ts,nop,ws:df,id+:0

Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/…

User-Agent claims Windows

TCP SYN initial TTL 48+16 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.4000.0 Iron Safari/537.36
Observed TTL	48+16 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-07-30

Decomposed attributes

IP version	`4`
Initial TTL	`48+16`
Options length	`0`
MSS	`1448`
Window size	`65535`
Window scale	`6`
Options layout	`mss,sok,ts,nop,ws`
Quirks	`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)

fingerprint	co-occurrences
`t13d4412h1_fd39b124ee10_58ed7828516f`	4
`t13d4312h1_c7886603b240_b26ce05bbdd6`	1
`t13d1515h1_8daaf6152771_de4a06bb82e3`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn050000_b223a0ebb0b5_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.34.2, python-requests 2.33.1, python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog.	5
`ge11nn13enus_9db22d02e17a_000000000000_000000000000`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`65535_2-4-8-1-3_1448_6`	6

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36`	1
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36`	1
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36`	1
`Mozilla/5.0 (Macintosh; Intel Mac OS X 11_0_0) AppleWebKit/537.36 (KHTML, like Gecko) Brave Chrome/86.0.4240.183 Safari/537.36`	1
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.163 Safari/537.36`	1
`Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.4000.0 Iron Safari/537.36`	1

Country

fingerprint	co-occurrences
`BR` · Brazil	3
`IT` · Italy	1
`VN` · Vietnam	1
`PK` · Pakistan	1

Network (ASN)

fingerprint	co-occurrences
`AS264589` · AGRESTE LINK	2
`AS18403` · FPT Telecom Company	1
`AS1267` · WIND TRE S.P.A.	1
`AS150683` · FASTTEL BROADBAND (PRIVATE) LIMITED	1
`AS269004` · MORE SPEED FIBRA	1