TCP SYN (p0f)

6:50+14:0:1440:mss*45,10:mss,sok,ts,nop,ws:flow:0

first seen 2026-07-06 02:36 · last seen 2026-09-16 10:17 · JSON

Last 7 days (8 observations)

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 TTL50+14
Options length0
MSS1440
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_8c06664c3ac58
t13d1617h2_86a278354501_3e9721a6796e1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn040000_bfa5a9b89dd6_000000000000_0000000000005
ge11nn05en00_61812dc1cc58_000000000000_0000000000003
ge20nr10enus_b3034183f430_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 154.0, +21 more.The fingerprint page shows the full measured match list. More on the catalog.1

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
64800_2-4-8-1-3_1440_109

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)8
Mozilla/5.0 (X11; Linux x86_64; rv:152.0) Gecko/20100101 Firefox/152.01

Country

fingerprintco-occurrences
FR · France8
US · United States1

Network (ASN)

fingerprintco-occurrences
AS16276 · OVH SAS8
AS7922 · Comcast Cable Communications, LLC1

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_78345df32b3a1