TCP SYN (p0f)

6:43+21:0:1432:mss*45,10:mss,sok,ts,nop,ws:flow:0

first seen 2026-07-01 16:28 · last seen 2026-07-18 08:50 · JSON

Decomposed attributes

IP version6
Initial TTL43+21
Options length0
MSS1432
Window sizemss*45
Window scale10
Options layoutmss,sok,ts,nop,ws
Quirksflow
Payload class0

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)

fingerprintco-occurrences
t12d290700_fc2078a0b8c0_8c06664c3ac52
t13d3113h1_e8f1e7e78f70_d339722ba4af1
t13d1514h2_8daaf6152771_53a6d0ab1c421

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn040000_bfa5a9b89dd6_000000000000_0000000000001
ge11nn030000_dd98166e0881_000000000000_0000000000001
ge11nn050000_f42f60d0fe7d_000000000000_0000000000001
ge20nr11enus_187a9385d229_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-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 154.0, +25 more.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (JA4T)

fingerprintco-occurrences
64440_2-4-8-1-3_1432_104

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)2
vroni-job-signals/1.0 (+manual review)1
Mozilla/5.0 (X11; Linux x86_64; rv:151.0) Gecko/20100101 Firefox/151.01

Country

fingerprintco-occurrences
DE · Germany4

Network (ASN)

fingerprintco-occurrences
AS15943 · wilhelm.tel GmbH2
AS12312 · ecotel communication ag1
AS8881 · 1&1 Versatel GmbH1

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).

fingerprintlinked observations
q13d0315h3_55b375c5d22e_dc5437974b471