TCP SYN (p0f)

4:47+17:0:1240:65535,8:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-09-04 07:28 · last seen 2026-10-15 20:22 · 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 version4
Initial TTL47+17
Options length0
MSS1240
Window size65535
Window scale8
Options layoutmss,sok,ts,nop,ws
Quirksdf,id+
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
t13d1515h1_8daaf6152771_de4a06bb82e34
t13d1515h1_8daaf6152771_0a20fe35d3a53
t13d1516h2_8daaf6152771_e5627efa2ab11
t13d1517h2_8daaf6152771_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 155.0.1, firefox 154.0, firefox 156.0, +8 more.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn13enus_9db22d02e17a_000000000000_0000000000006
ge20nn12enus_60f823d07c94_000000000000_0000000000001
ge20nr10ruru_b3034183f430_000000000000_0000000000001
ge11nn14enus_4a2973d235de_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;3:1000;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p1
1:4096;2:0;4:32768;5:16384|12517377|3:0:0:22|m,p,a,s1

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-4-8-1-3_1240_89

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.363
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.361
Mozilla/5.0 (Android 16; Mobile; rv:156.0) Gecko/156.0 Firefox/156.01

Country

fingerprintco-occurrences
US · United States5
DE · Germany1
GB · United Kingdom1
BE · Belgium1
AT · Austria1

Network (ASN)

fingerprintco-occurrences
AS36352 · HostPapa3
AS9009 · M247 Europe SRL2
AS62240 · Clouvider2
AS215439 · PLAY2GO INTERNATIONAL LIMITED1
AS62651 · Strong Technology, LLC.1

TLS supported groups

fingerprintco-occurrences
0a0a,001d,0017,00181

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_bb76f32061e31