TCP SYN (p0f)

6:241+14:0:1220:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:ecn,flow:0

first seen 2026-10-23 11:41 · last seen 2026-10-23 11:41 · JSON

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	`6`
Initial TTL	`241+14`
Options length	`0`
MSS	`1220`
Window size	`65535`
Window scale	`6`
Options layout	`mss,nop,ws,nop,nop,ts,sok,eol+1`
Quirks	`ecn,flow`
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
`t13d181000_5d04281c6031_25d8bb11352d`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn050000_2469c960a647_000000000000_000000000000`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`65535_2-1-3-1-1-8-4-0-0_1220_6`	1

User-Agent

fingerprint	co-occurrences
`Claude-User (claude-code/2.1.306; +https://support.anthropic.com/)`	1

Country

fingerprint	co-occurrences
`DE` · Germany	1

Network (ASN)

fingerprint	co-occurrences
`AS3320` · Deutsche Telekom AG	1

TLS supported groups

fingerprint	co-occurrences
`11ec,001d,0017,0018` Match?Exact match in Thumbprint's published controlled catalog captures: chrome 155.0.8059.40, chrome 156.0.8078.73, chromium 156.0.8078.47, +8 more.The fingerprint page shows the full measured match list. More on the catalog.	1