TCP SYN (JA4T)

64952_2-4-8-1-3_1412_8

first seen 2026-07-03 07:08 · last seen 2026-10-28 07:50 · 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

TCP window64952
Option kinds2-4-8-1-3
MSS1412
Window scale8

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
t13d191000_9dc949149365_e7c2852226517

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn030000_32287c24fa5b_000000000000_0000000000007

TCP SYN (p0f)

fingerprintco-occurrences
4:44+20:0:1412:mss*46,8:mss,sok,ts,nop,ws:df,id+:05
4:43+21:0:1412:mss*46,8:mss,sok,ts,nop,ws:df,id+:01
4:41+23:0:1412:mss*46,8:mss,sok,ts,nop,ws:df,id+:01

User-Agent

fingerprintco-occurrences
curl/7.29.07

Country

fingerprintco-occurrences
HK · Hong Kong SAR China7

Network (ASN)

fingerprintco-occurrences
AS135377 · UCLOUD INFORMATION TECHNOLOGY (HK) LIMITED7

TLS supported groups

fingerprintco-occurrences
001d,0017,0018,0019 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.1