TCP SYN (p0f)

4:53+11:0:1360:mss*44,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-30 08:23 · last seen 2026-10-04 12:16 · 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

4:53+11:0:1360:mss*44,7: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 53+11 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/84.0.4147.89 Safari/537.36
Observed TTL	53+11 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-09-06

Distinct clients per day (last 30 days, peak 1/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	`4`
Initial TTL	`53+11`
Options length	`0`
MSS	`1360`
Window size	`mss*44`
Window scale	`7`
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
`t13i170900_5b57614c22b0_78e6aca7449b`	1
`t13d181100_85036bcba153_d41ae481755e`	1
`t13d2013h1_2b729b4bf6f3_e24568c0d440`	1
`t13d4412h1_fd39b124ee10_58ed7828516f`	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.	1
`ge11nn040000_e1d2031bdfea_000000000000_000000000000`	1
`ge11nn030000_fe444ad14866_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.16.0, curl 7.88.1, curl 8.21.0, +1 more.The fingerprint page shows the full measured match list. More on the catalog.	1
`ge11nn070000_fd2827074311_000000000000_000000000000`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`64240_2-4-8-1-3_1360_7`	4

User-Agent

fingerprint	co-occurrences
`libredtail-http`	1
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.89 Safari/537.36`	1
`curl/8.21.0`	1
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36`	1

Country

fingerprint	co-occurrences
`US` · United States	2
`LV` · Latvia	1
`BD` · Bangladesh	1

Network (ASN)

fingerprint	co-occurrences
`AS9009` · M247 Europe SRL	1
`AS7922` · Comcast Cable Communications, LLC	1
`AS149287` · Mynet Technologies	1
`AS56971` · AS56971 Cloud	1