TCP SYN (p0f)

4:46+18:0:1412:mss*23,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-23 18:54 · last seen 2026-10-19 05:55 · 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	`46+18`
Options length	`0`
MSS	`1412`
Window size	`mss*23`
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
`t13d131000_f57a46bbacb6_e7c285222651` Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.23.12.The fingerprint page shows the full measured match list. More on the catalog.	11
`t13i170900_5b57614c22b0_78e6aca7449b`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nr050000_3658ef221638_000000000000_000000000000`	7
`ge11nr05zhcn_f3bb7aa45ec4_000000000000_000000000000`	3
`ge11nn03zhcn_295e410d3834_000000000000_000000000000`	1
`ge11nn070000_ca40d4d1460e_000000000000_000000000000`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`32476_2-4-8-1-3_1412_7`	12

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (compatible; foda-scanner/0.1)`	7
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 Edg/120.0.0.0`	4
`libredtail-http`	1

Country

fingerprint	co-occurrences
`HK` · Hong Kong SAR China	8
`US` · United States	2
`SG` · Singapore	2

Network (ASN)

fingerprint	co-occurrences
`AS135377` · UCLOUD INFORMATION TECHNOLOGY (HK) LIMITED	12

TLS supported groups

fingerprint	co-occurrences
`0a0a,11ec,001d,0017,0018` Match?Exact match in Thumbprint's published controlled catalog captures: chrome 155.0.8059.40, chrome 156.0.8078.73, chromium 156.0.8078.47, +8 more.The fingerprint page shows the full measured match list. More on the catalog.	1