TCP SYN (p0f)

4:105+23:0:1380:65535,8:mss,nop,ws,nop,nop,sok:df,id+:0

first seen 2026-07-02 17:01 · last seen 2026-08-27 14:42 · 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 TTL105+23
Options length0
MSS1380
Window size65535
Window scale8
Options layoutmss,nop,ws,nop,nop,sok
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
t13d2913h1_723694b0fccc_5671b5df50292
t12d180700_4b22cbed5bed_2dae41c691ec1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn050000_2469c960a647_000000000000_0000000000001
ge11nr11ensg_835281d8e5d9_000000000000_0000000000001
ge11nn11ensg_835281d8e5d9_000000000000_0000000000001

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-1-3-1-1-4_1380_83

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (iPad; CPU OS 16_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.7 Mobile/15E148 Safari/604.12
Mozilla/5.01

Country

fingerprintco-occurrences
SG · Singapore2
TW · Taiwan1

Network (ASN)

fingerprintco-occurrences
AS4657 · StarHub Ltd2
AS21859 · Zenlayer Inc1