TCP SYN (p0f)

4:54+10:0:1460:mss*29,10:mss,nop,nop,sok,nop,ws:df,id+:0

first seen 2026-10-18 19:03 · last seen 2026-10-19 06:58 · 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 TTL54+10
Options length0
MSS1460
Window sizemss*29
Window scale10
Options layoutmss,nop,nop,sok,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
t13i250900_b78ed14e2fd0_e7c2852226512

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn030000_fe444ad14866_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.16.0, curl 7.88.1, curl 8.21.0, +1 more.The fingerprint page shows the full measured match list. More on the catalog.2

TCP SYN (JA4T)

fingerprintco-occurrences
42340_2-1-1-4-1-3_1460_102

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.361
Mozilla/5.0 (X11; Linux x86_64; rv:115.0) Gecko/20100101 Firefox/115.01

Country

fingerprintco-occurrences
NL · Netherlands2

Network (ASN)

fingerprintco-occurrences
AS62005 · BlueVPS OU2

TLS supported groups

fingerprintco-occurrences
6399,001d,0017,0018,00192