TCP SYN (p0f)

4:46+18:0:1412:mss*1,9:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-08-17 14:59 · last seen 2026-09-02 08:08 · JSON

Distinct clients per day (last 30 days, peak 2/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 TTL46+18
Options length0
MSS1412
Window sizemss*1
Window scale9
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
t13d1911h2_9dc949149365_e7c285222651 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13.The fingerprint page shows the full measured match list. More on the catalog.8

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn04zhcn_4bdba6e1e609_000000000000_0000000000005
ge20nn04zhcn_6e6dd1d8c348_000000000000_0000000000002
ge20nn04zhcn_000ee8a720b8_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;4:4194304;6:10485760|1073741824|0|a,m,p,s Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13, go-net/http 1.23.12.The fingerprint page shows the full measured match list. More on the catalog.8

TCP SYN (JA4T)

fingerprintco-occurrences
1412_2-4-8-1-3_1412_98

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.368

Country

fingerprintco-occurrences
HK · Hong Kong SAR China8

Network (ASN)

fingerprintco-occurrences
AS135377 · UCLOUD INFORMATION TECHNOLOGY (HK) LIMITED8