TCP SYN (p0f)

4:42+22:0:1452:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,ecn:0

first seen 2026-08-22 15:33 · last seen 2026-08-28 03:31 · JSON

Decomposed attributes

IP version	`4`
Initial TTL	`42+22`
Options length	`0`
MSS	`1452`
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
`t13d1812h1_85036bcba153_b26ce05bbdd6`	1
`t13d1516h2_8daaf6152771_0c27189014cf` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 155.0.1, firefox 155.0, +6 more.The fingerprint page shows the full measured match list. More on the catalog.	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn050000_b223a0ebb0b5_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.34.2, python-requests 2.33.1, python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog.	1
`ge20nr12enus_1204b4dfdccd_000000000000_000000000000`	1

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`1:65536;2:0;4:131072;5:16384\|12517377\|3:0:0:22\|m,p,a,s` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 155.0.1, +32 more.The fingerprint page shows the full measured match list. More on the catalog.	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`65535_2-1-3-1-1-8-4-0-0_1452_6`	2

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0 Safari/537.36`	1
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:154.0) Gecko/20100101 Firefox/154.0`	1

Country

fingerprint	co-occurrences
`BR` · Brazil	1
`HU` · Hungary	1

Network (ASN)

fingerprint	co-occurrences
`AS5483` · Magyar Telekom Plc.	1
`AS27699` · TELEFÔNICA BRASIL S.A	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
`q13d0315h3_55b375c5d22e_dc5437974b47`	1