TCP SYN (p0f)

4:111+17:0:1360:mss*48,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:0

first seen 2026-07-25 11:10 · last seen 2026-10-25 03:58 · 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

4:111+17:0:1360:mss*48,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:0

Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:122.0…

User-Agent claims Linux

TCP SYN initial TTL 111+17 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; Ubuntu; Linux x86_64; rv:122.0) Gecko/20100101 Firefox/122.0
Observed TTL	111+17 (observed + path distance → initial)
Claimed OS	Linux
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	`111+17`
Options length	`0`
MSS	`1360`
Window size	`mss*48`
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_d41ae481755e`	4
`t13d181100_85036bcba153_d41ae481755e`	1
`t13d4312h1_c7886603b240_8d633dac7124`	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
`po11nn060000_d8e0803a0d25_000000000000_000000000000`	1
`ge11cn040000_e1d2031bdfea_b04fd684bb87_349cc859444c`	1
`ge11nn06enus_ac0ce46833c4_000000000000_000000000000`	1
`ge11cn040000_e1d2031bdfea_b04fd684bb87_cf6d1e4ab639`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`65280_2-1-3-1-1-4_1360_8`	6

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 compatible; FastSourceScanner/1.0`	3
`wp2shell`	1
`python-requests/2.25.1`	1
`Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:122.0) Gecko/20100101 Firefox/122.0`	1

Country

fingerprint	co-occurrences
`NL` · Netherlands	3
`ID` · Indonesia	2
`GB` · United Kingdom	1

Network (ASN)

fingerprint	co-occurrences
`AS213790` · Limited Network LTD	4
`AS58477` · Argon Data Communication	2

TLS supported groups

fingerprint	co-occurrences
`001d,0017,001e,0019,0018`	1