TCP SYN (p0f)

4:48+16:0:1400:mss*20,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-02 07:45 · last seen 2026-10-26 10:05 · JSON

Last 7 days (1 observations)

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
MSS1400
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
t13d4312h1_c7886603b240_b26ce05bbdd615
t13d491000_834380eab35e_5ac7197df9d22
t13d190900_9dc949149365_97f8aa674fd91

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn050000_b223a0ebb0b5_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.34.2, python-requests 2.33.1, python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog.15
ge11nn050000_0b4164a3b800_000000000000_0000000000001
ge11nn060000_04b3596173ac_000000000000_0000000000001
ge11nn050000_8a2d9ed0c674_000000000000_0000000000001

TCP SYN (JA4T)

fingerprintco-occurrences
29200_2-4-8-1-3_1400_718

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) Chrome/120.0.0.015
Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Mobile Safari/537.362
Go-http-client/1.11

Country

fingerprintco-occurrences
CN · China18

Network (ASN)

fingerprintco-occurrences
AS4837 · CHINA UNICOM China169 Backbone9
AS4134 · CHINANET BACKBONE8
AS17622 · China Unicom Guangzhou network1

TLS supported groups

fingerprintco-occurrences
001d,0017,001e,0019,00183