TCP SYN (p0f)

4:45+19:0:1460:mss*5,10:mss,sok,ts,nop,ws:df,id+,ecn:0

first seen 2026-06-12 10:08 · last seen 2026-09-07 13:01 · 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 TTL45+19
Options length0
MSS1460
Window sizemss*5
Window scale10
Options layoutmss,sok,ts,nop,ws
Quirksdf,id+,ecn
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
t13d1312h2_f57a46bbacb6_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.8, go-net/http 1.26.7, +5 more.The fingerprint page shows the full measured match list. More on the catalog.6
t13i1311h2_f57a46bbacb6_ab7e3b40a6771

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr020000_fb4f949fd323_000000000000_0000000000005
ge20nn030000_0db47b7d240d_000000000000_0000000000001
ge20nr030000_0db47b7d240d_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;4:4194304;5:16384;6:10485760|1073741824|0|a,m,p,s Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.8, go-net/http 1.26.7, +6 more.The fingerprint page shows the full measured match list. More on the catalog.7

TCP SYN (JA4T)

fingerprintco-occurrences
7300_2-4-8-1-3_1460_103

User-Agent

fingerprintco-occurrences
curl/7.74.07

Country

fingerprintco-occurrences
MY · Malaysia7

Network (ASN)

fingerprintco-occurrences
AS45102 · Alibaba (US) Technology Co., Ltd.7