TCP SYN (p0f)

4:53+11:0:1460:62727,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-10-07 02:12 · last seen 2026-10-14 11:52 · JSON

Distinct clients per day (last 30 days, peak 2/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	`1460`
Window size	`62727`
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
`t13d5212h2_b262b3658495_8e6e362c5eac`	5

HTTP request (JA4H)

fingerprint	co-occurrences
`ge20nn09en00_9507e94052e1_000000000000_000000000000`	5

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`2:0\|00\|0\|m,p,a,s`	5

TCP SYN (JA4T)

fingerprint	co-occurrences
`62727_2-4-8-1-3_1460_7`	5

User-Agent

fingerprint	co-occurrences
`Iframely/1.3.1 (+https://iframely.com/docs/about) Atlassian`	5

Country

fingerprint	co-occurrences
`US` · United States	5

Network (ASN)

fingerprint	co-occurrences
`AS14618` · Amazon.com, Inc.	5

TLS supported groups

fingerprint	co-occurrences
`11ec,001d,0017,001e,0018,0019,0100,0101` Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.22.1, python-httpx 0.28.1, python-requests 2.34.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog.	1