TCP SYN (p0f)

4:42+22:0:1424:25380,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-11 13:50 · last seen 2026-10-29 04:11 · JSON

Last 7 days (2 observations)

Distinct clients per day (last 30 days, peak 3/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	`42+22`
Options length	`0`
MSS	`1424`
Window size	`25380`
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
`t13d131100_f57a46bbacb6_e5728521abd4`	96

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn10zhcn_9c0cf7475f83_000000000000_000000000000`	82
`ge11nr10zhcn_9c0cf7475f83_000000000000_000000000000`	11
`ge11nn08zhcn_bd35aedc6348_000000000000_000000000000`	3

TCP SYN (JA4T)

fingerprint	co-occurrences
`25380_2-4-8-1-3_1424_7`	93

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Mobile/15E148 Safari/604.1`	96

Country

fingerprint	co-occurrences
`TH` · Thailand	61
`ID` · Indonesia	31
`SG` · Singapore	3
`JP` · Japan	1

Network (ASN)

fingerprint	co-occurrences
`AS132203` · Tencent Building, Kejizhongyi Avenue	96

TLS supported groups

fingerprint	co-occurrences
`11ec,001d,0017,0018,0019` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 157.0.1, firefox-esr 153.5.1esr, firefox 158.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.	15