TCP SYN (p0f)

6:59+5:0:1220:65535,9:mss,sok,ts,nop,ws:flow:0

first seen 2026-10-10 19:09 · last seen 2026-10-24 14:09 · JSON

Last 7 days (4 observations)

Distinct clients per day (last 30 days, peak 4/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	`59+5`
Options length	`0`
MSS	`1220`
Window size	`65535`
Window scale	`9`
Options layout	`mss,sok,ts,nop,ws`
Quirks	`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
`t13d3013h1_1d37bd780c83_8537cf56674e`	4
`t13d301200_1d37bd780c83_ecd0401ec68b`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn06en00_fb4afd1f380a_000000000000_000000000000`	4
`ge11nn040000_5b1e8b5f4d2d_000000000000_000000000000`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`65535_2-4-8-1-3_1220_9`	5

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (compatible; YashLeadBot/1.0; +https://www.byyash.xyz)`	4
`Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 Chrome/126 Safari/537.36`	1

Country

fingerprint	co-occurrences
`US` · United States	5

Network (ASN)

fingerprint	co-occurrences
`AS54113` · Fastly, 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.	4