TCP SYN (p0f)

4:108+20:0:1460:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:0

first seen 2026-06-13 19:59 · last seen 2026-09-14 19:26 · 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

4:108+20:0:1460:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:0

Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.…

User-Agent claims Linux

TCP SYN initial TTL 108+20 indicates Windows

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 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36
Observed TTL	108+20 (observed + path distance → initial)
Claimed OS	Linux
Confidence	low — single sighting of an environmental signal

low

2026-09-14

4:108+20:0:1460:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:0

Mozilla/5.0 (Linux; U; Android 12; zh-Hans-CN; J…

User-Agent claims Android

TCP SYN initial TTL 108+20 indicates Windows

Full User-Agent	Mozilla/5.0 (Linux; U; Android 12; zh-Hans-CN; JAD-AL50 Build/HUAWEIJAD-AL50) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/100.0.4896.58 Quark/7.6.5.720 Mobile Safari/537.36
Observed TTL	108+20 (observed + path distance → initial)
Claimed OS	Android
Confidence	low — single sighting of an environmental signal

low

2026-08-12

Last 7 days (1 observations)

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	`108+20`
Options length	`0`
MSS	`1460`
Window size	`mss*44`
Window scale	`8`
Options layout	`mss,nop,ws,nop,nop,sok`
Quirks	`df,id+,ecn`
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
`t13d1812h1_85036bcba153_b26ce05bbdd6`	1
`t13d3112h1_e8f1e7e78f70_24695f2957a7`	1
`t13d131000_f57a46bbacb6_e7c285222651` Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.23.12.The fingerprint page shows the full measured match list. More on the catalog.	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn040000_608e01151bf4_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog.	1
`ge11nn06zhcn_90b9989cdd5a_000000000000_000000000000`	1
`ge11nn020000_2f58a845b48b_000000000000_000000000000`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`64240_2-1-3-1-1-4_1460_8`	2

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Windows NT 10.0; WOW64; rv:48.0) Gecko/20100101 Firefox/48.0`	1
`Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36`	1
`Mozilla/5.0 (Linux; U; Android 12; zh-Hans-CN; JAD-AL50 Build/HUAWEIJAD-AL50) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/100.0.4896.58 Quark/7.6.5.720 Mobile Safari/537.36`	1

Country

fingerprint	co-occurrences
`DE` · Germany	1
`HK` · Hong Kong SAR China	1
`CN` · China	1

Network (ASN)

fingerprint	co-occurrences
`AS16276` · OVH SAS	1
`AS45753` · Netsec Limited	1
`AS37963` · Hangzhou Alibaba Advertising Co.,Ltd.	1