TCP SYN (p0f)

4:55+9:0:1460:35640,9:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-09-29 22:09 · last seen 2026-11-01 09:29 · JSON

Last 7 days (2 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	`55+9`
Options length	`0`
MSS	`1460`
Window size	`35640`
Window scale	`9`
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
`t13d1713h1_ab0a1bf427ad_ecd0401ec68b` Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1.The fingerprint page shows the full measured match list. More on the catalog.	4

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn11enus_f52f937d55db_000000000000_000000000000`	4

TCP SYN (JA4T)

fingerprint	co-occurrences
`35640_2-4-8-1-3_1460_9`	4

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (iPhone; CPU iPhone OS 17_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0 Mobile/15E148 Safari/604.1`	4

Country

fingerprint	co-occurrences
`US` · United States	4

Network (ASN)

fingerprint	co-occurrences
`AS31898` · Oracle Corporation	4

TLS supported groups

fingerprint	co-occurrences
`11ec,001d,0017,001e,0018,0019,0100,0101` Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1, python-requests 2.34.2, curl 8.23.0, +4 more.The fingerprint page shows the full measured match list. More on the catalog.	2