TCP SYN (p0f)

6:59+5:0:1440:mss*30,11:mss,nop,nop,sok,nop,ws:flow:0

first seen 2026-07-06 10:41 · last seen 2026-09-03 10:01 · 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 version6
Initial TTL59+5
Options length0
MSS1440
Window sizemss*30
Window scale11
Options layoutmss,nop,nop,sok,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
t13d1714h2_5b57614c22b0_3dd24b5ebec45
t13d1715h2_5b57614c22b0_a54fffd0eb611

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr11enus_187a9385d229_000000000000_0000000000005
ge20nr11enus_684b26f0fcdf_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:4096;2:0;4:32768;5:16384|12517377|3:0:0:22|m,p,a,s2
1:4096;2:0;4:32768;5:16384|12517377|5:0:0:22|m,p,a,s1
1:4096;2:0;4:32768;5:16384|12517377|7:0:0:22|m,p,a,s1
1:4096;2:0;4:32768;5:16384|12517377|3:0:0:42|m,p,a,s1
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
43200_2-1-1-4-1-3_1440_116

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Android 10; Mobile; rv:140.0) Gecko/140.0 Firefox/140.05
Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.01

Country

fingerprintco-occurrences
DE · Germany6

Network (ASN)

fingerprintco-occurrences
AS60729 · Stiftung Erneuerbare Freiheit6