TCP SYN (p0f)

4:48+16:0:1380:mss*20,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-10-04 16:12 · last seen 2026-10-04 16:12 · 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 TTL48+16
Options length0
MSS1380
Window sizemss*20
Window scale7
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
t13d1717h2_5b57614c22b0_68c5a8c2958d1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn10kokr_71a24014cdf5_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:131072;5:16384|12517377|1:0:0:42|m,p,a,s1

TCP SYN (JA4T)

fingerprintco-occurrences
27600_2-4-8-1-3_1380_71

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:147.0) Gecko/20100101 Firefox/147.01

Country

fingerprintco-occurrences
CN · China1

Network (ASN)

fingerprintco-occurrences
AS4134 · CHINANET BACKBONE1