TCP SYN (p0f)

4:52+12:0:1360:mss*44,8:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-10-08 16:21 · last seen 2026-10-08 16:21 · 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 TTL52+12
Options length0
MSS1360
Window sizemss*44
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
t12d210700_76e208dd3e22_f28add8e7af01

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.1

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1360_81

User-Agent

fingerprintco-occurrences
curl/7.55.11

Country

fingerprintco-occurrences
US · United States1

Network (ASN)

fingerprintco-occurrences
AS399629 · BL Networks1