TCP SYN (p0f)

4:49+15:0:1460:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:id-:0

first seen 2026-06-29 23:17 · last seen 2026-09-23 09:12 · JSON

Matches controlled captures

Known clients driven through this site's own edge produced this exact fingerprint — measured truth, not inference. catalog →

curl 8.7.1 · macOS 26.5.2 · ci — 1 session, last 2026-09-01 01:04 controlled
curl 8.7.1 · macOS 15.7.7 · ci — 3 sessions, last 2026-08-26 06:40 controlled
firefox 153.0 · macOS 15.7.7 · via geckodriver · ci — 4 sessions, last 2026-08-26 06:39 controlled
safari 26.5.2 · macOS 15.7.7 · ci — 2 sessions, last 2026-08-18 11:39 controlled
chrome 150.0.7871.187 · macOS 15.7.7 · ci — 2 sessions, last 2026-08-18 10:28 controlled
safari 26.5 · macOS 15.7.7 · ci — 2 sessions, last 2026-07-02 03:04 controlled
firefox 152.0.1 · macOS 15.7.7 · ci — 1 session, last 2026-07-01 01:03 controlled
chrome 149.0.7827.156 · macOS 15.7.7 · ci — 1 session, last 2026-07-01 00:59 controlled

TCP SYN signatures from container or CI runners reflect the capture environment's kernel and network path, not the named client — the layers above (TLS, HTTP/2, HTTP) are the client's own.

Decomposed attributes

IP version	`4`
Initial TTL	`49+15`
Options length	`0`
MSS	`1460`
Window size	`65535`
Window scale	`6`
Options layout	`mss,nop,ws,nop,nop,ts,sok,eol+1`
Quirks	`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
`t13d2014h2_a09f3c656075_14788d8d241b`	1
`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.	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge20nn04engb_39a3ba4480e8_000000000000_000000000000`	1
`ge20nr13enus_05d774e75578_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.	1
`4:2097152;3:100\|10485760\|1:0:0:255\|m,s,p,a`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`65535_2-1-3-1-1-8-4-0-0_1460_6`	2

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (iPhone; CPU iPhone OS 15_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.6 Mobile/15E148 Safari/604.1`	1
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/153.0.0.0 Safari/537.36`	1

Country

fingerprint	co-occurrences
`AU` · Australia	1
`CA` · Canada	1

Network (ASN)

fingerprint	co-occurrences
`AS15830` · Equinix (EMEA) Acquisition Enterprises B.V.	1
`AS812` · Rogers Communications Canada Inc.	1

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`	1