TCP SYN (p0f)

6:43+21:0:1220:mss*53,7:mss,sok,ts,nop,ws::0

first seen 2026-07-01 16:01 · last seen 2026-09-04 20:40 · 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	`43+21`
Options length	`0`
MSS	`1220`
Window size	`mss*53`
Window scale	`7`
Options layout	`mss,sok,ts,nop,ws`
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
`t13d1516h2_8daaf6152771_806a8c22fdea` Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 151.0.7922.137, chromium 151.0.7922.34, +24 more.The fingerprint page shows the full measured match list. More on the catalog.	3
`t13d1516h2_8daaf6152771_9a55b862dad6`	1
`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.	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge20nr14enus_4600588ae5ca_000000000000_000000000000`	3
`ge20nn12enus_60f823d07c94_000000000000_000000000000`	1
`ge11nn130000_8024c23a46d9_000000000000_000000000000`	1

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`1:65536;2:0;4:6291456;6:262144\|15663105\|1:1:0:220\|m,a,s,p` Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chromium 149.0.7827.102, chrome 149.0.7827.102, +59 more.The fingerprint page shows the full measured match list. More on the catalog.	3
`1:65536;2:0;4:6291456;6:262144\|15663105\|0\|m,a,s,p`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`64660_2-4-8-1-3_1220_7`	5

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36`	2
`Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.36`	2
`Mozilla/5.0 (iPhone; CPU iPhone OS 17_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/120.0.6099.119 Version/17.2 Mobile/15E148 Safari/604.1`	1

Country

fingerprint	co-occurrences
`US` · United States	5

Network (ASN)

fingerprint	co-occurrences
`AS396982` · Google LLC	5