TCP SYN (p0f)

4:55+9:0:1460:mss*44,7:mss,sok,ts,nop,ws:df:0

first seen 2026-10-19 09:21 · last seen 2026-10-19 09:21 · 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	`4`
Initial TTL	`55+9`
Options length	`0`
MSS	`1460`
Window size	`mss*44`
Window scale	`7`
Options layout	`mss,sok,ts,nop,ws`
Quirks	`df`
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
`t13d751100_479067518aa3_d41ae481755e`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge10nn020000_d5c75abc5c2c_000000000000_000000000000`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`64240_2-4-8-1-3_1460_7`	1

Country

fingerprint	co-occurrences
`US` · United States	1

Network (ASN)

fingerprint	co-occurrences
`AS40021` · Contabo Inc.	1

TLS supported groups

fingerprint	co-occurrences
`001d,0017,001e,0019,0018,0100,0101,0102,0103,0104` Match?Exact match in Thumbprint's published controlled catalog captures: php-guzzle 8.3.1, curl 7.88.1, curl 8.13.0, +10 more.The fingerprint page shows the full measured match list. More on the catalog.	1