TCP SYN (p0f)

4:44+20:0:1412:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,ecn:0

first seen 2026-06-19 16:55 · last seen 2026-09-17 08:39 · JSON

Decomposed attributes

IP version	`4`
Initial TTL	`44+20`
Options length	`0`
MSS	`1412`
Window size	`65535`
Window scale	`6`
Options layout	`mss,nop,ws,nop,nop,ts,sok,eol+1`
Quirks	`df,ecn`
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
`t13d1714h1_5b57614c22b0_43ade6aba3df`	5
`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, +28 more.The fingerprint page shows the full measured match list. More on the catalog.	4
`t13d181000_5d04281c6031_78e6aca7449b`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn040000_217776c81665_000000000000_000000000000`	5
`ge20nr13enus_05d774e75578_000000000000_000000000000`	4
`ge11nn060000_8064edffa6a6_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 152.0.7977.83, +85 more.The fingerprint page shows the full measured match list. More on the catalog.	4

TCP SYN (JA4T)

fingerprint	co-occurrences
`65535_2-1-3-1-1-8-4-0-0_1412_6`	5

User-Agent

fingerprint	co-occurrences
`curl/8.7.1`	4
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/152.0.0.0 Safari/537.36`	4
`bun-fingerprint-check/1.0`	1
`PostmanRuntime/2.5.2`	1

Country

fingerprint	co-occurrences
`CN` · China	5
`LK` · Sri Lanka	5

Network (ASN)

fingerprint	co-occurrences
`AS4134` · CHINANET BACKBONE	5
`AS9329` · Sri Lanka Telecom Internet	5

Cross-transport links

TLS ClientHello fingerprints observed from the same client via the beacon's correlation id on the other transport (e.g. this stack over TCP ↔ that stack over QUIC).

fingerprint	linked observations
`q13d0311h3_55b375c5d22e_653d80c3fe9d`	4