TCP SYN (p0f)

4:41+23:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-27 02:43 · last seen 2026-10-31 21:50 · JSON

Last 7 days (3 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	`41+23`
Options length	`0`
MSS	`1418`
Window size	`mss*44`
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
`t13d1713h2_5b57614c22b0_02c8e53ee398`	7
`t13d1712h2_5b57614c22b0_ef7df7f74e48`	3
`t13d1712h2_5b57614c22b0_d5fe2c511efa`	2

HTTP request (JA4H)

fingerprint	co-occurrences
`ge20nn06enus_32386ca2063f_000000000000_000000000000`	12

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`2:0;1:4096;8:0;3:1024;4:1048576\|25100289\|0\|a,p,m,s`	12

TCP SYN (JA4T)

fingerprint	co-occurrences
`64240_2-4-8-1-3_1418_9`	12

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ChatGPT-User/1.0; +https://openai.com/bot`	12

Country

fingerprint	co-occurrences
`NZ` · New Zealand	4
`IT` · Italy	4
`KR` · South Korea	1
`BE` · Belgium	1
`PL` · Poland	1
`IN` · India	1

Network (ASN)

fingerprint	co-occurrences
`AS8075` · Microsoft Corporation	12

TLS supported groups

fingerprint	co-occurrences
`001d,0017,0018,0019` Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13, curl 8.7.1.The fingerprint page shows the full measured match list. More on the catalog.	5