TCP SYN (p0f)

4:53+11:0:1460:mss*44,14:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-10-23 22:03 · last seen 2026-10-23 22:43 · JSON

Distinct clients per day (last 30 days, peak 27/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 TTL53+11
Options length0
MSS1460
Window sizemss*44
Window scale14
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
t13d3013h2_1d37bd780c83_8537cf56674e27

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn030000_bf75ddd0bb29_000000000000_00000000000027

HTTP/2 frames (Akamai)

fingerprintco-occurrences
3:100;4:65536;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, curl 8.18.0, curl 8.21.0, +8 more.The fingerprint page shows the full measured match list. More on the catalog.27

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_1427

User-Agent

fingerprintco-occurrences
curl/8.14.127

Country

fingerprintco-occurrences
LU · Luxembourg7
TW · Taiwan3
HR · Croatia3
BR · Brazil2
EE · Estonia2
MA · Morocco2
CY · Cyprus2
NO · Norway1
HK · Hong Kong SAR China1
BG · Bulgaria1

Network (ASN)

fingerprintco-occurrences
AS7979 · Servers.com, Inc.7
AS55720 · Gigabit Hosting Sdn Bhd3
AS12417 · Plus Hosting Grupa d.o.o.3
AS37738 · HOSTOWEB3
AS40676 · Psychz Networks2
AS34702 · Aktsiaselts WaveCom2
AS56655 · Gigahost AS1
AS60068 · Datacamp Limited1
AS35758 · Rachamim Aviel Twito1
AS6866 · Cyprus Telecommunications Authority1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.22.1, python-httpx 0.28.1, python-requests 2.34.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog.27