TCP SYN (p0f)

4:42+22:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-01 15:07 · last seen 2026-08-22 20:23 · 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	`42+22`
Options length	`0`
MSS	`1460`
Window size	`mss*44`
Window scale	`10`
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_ab7e3b40a677` Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.5, go-net/http 1.26.4.The fingerprint page shows the full measured match list. More on the catalog.	5
`t13d5911h1_a33745022dd6_1f22a2ca17c4` Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 23.11.1.The fingerprint page shows the full measured match list. More on the catalog.	2
`t13d1516h2_8daaf6152771_d8a2da3f94cd` Match?Exact match in Thumbprint's published controlled catalog captures: chromium 149.0.7827.102, chrome 149.0.7827.102, chrome 149.0.7827.156, +25 more.The fingerprint page shows the full measured match list. More on the catalog.	1
`t13d121100_a538d02d76d5_f6eeaf393d2e`	1
`t13d311100_e8f1e7e78f70_d41ae481755e` Match?Exact match in Thumbprint's published controlled catalog captures: rust-hyper 1.11.0, rust-hyper 1.11.1, rust-hyper 1.10.1.The fingerprint page shows the full measured match list. More on the catalog.	1
`t13d101000_61a7ad8aa9b6_3fcd1a44f3e3`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn040000_e1d2031bdfea_000000000000_000000000000`	2
`ge11nn05enus_f3bb7aa45ec4_000000000000_000000000000`	2
`ge20nn15enus_a80081d13d36_000000000000_000000000000`	1
`ge11nr030000_cd680697de12_000000000000_000000000000`	1
`ge11nn040000_482ead9c94af_000000000000_000000000000`	1
`ge11nn06enus_98e697c2fa06_000000000000_000000000000`	1
`ge11nn07*000_fd87022947da_000000000000_000000000000`	1
`ge11nn07*000_2f91038604b7_000000000000_000000000000`	1
`ge11nn040000_65966f2de38a_000000000000_000000000000`	1

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`1:65536;2:0;4:6291456;6:262144\|15663105\|1:1:0:256\|m,a,s,p` Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 151.0.7922.34, chrome 151.0.7922.137, +43 more.The fingerprint page shows the full measured match list. More on the catalog.	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`64240_2-4-8-1-3_1460_10`	11

User-Agent

fingerprint	co-occurrences
`AIWebIndex/2.0 (+https://lyrenth.com/bot; AI-readable web index)`	4
`Go-http-client/1.1`	1
`Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 Chrome/116.0.0.0 Safari/537.36`	1
`VerifiedApp-Scanner/0.1.0 (+https://verifiedapp.io/scanner-info)`	1
`f1tym1-scraper/1.0 (+https://f1tym1.com/sources/)`	1
`HUNT-Bot/0.1`	1
`HUNT-Bot/0.1 (+https://github.com/hunt-discovery; discovery engine)`	1
`ureq/2.12.1`	1

Country

fingerprint	co-occurrences
`DE` · Germany	9
`US` · United States	1
`DK` · Denmark	1

Network (ASN)

fingerprint	co-occurrences
`AS24940` · Hetzner Online GmbH	8
`AS8560` · IONOS SE	1
`AS10796` · Charter Communications Inc	1
`AS209424` · FASTSPEED A/S	1