TCP SYN (JA4T)

65535_2-1-3_1360_8

first seen 2026-10-23 22:04 · last seen 2026-10-23 22:39 · JSON

Distinct clients per day (last 30 days, peak 10/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 window65535
Option kinds2-1-3
MSS1360
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
t13d3013h2_1d37bd780c83_8537cf56674e10

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn030000_bf75ddd0bb29_000000000000_00000000000010

HTTP/2 frames (Akamai)

fingerprintco-occurrences
3:100;4:65536;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, curl 8.18.0, curl 8.21.0, +8 more.The fingerprint page shows the full measured match list. More on the catalog.10

TCP SYN (p0f)

fingerprintco-occurrences
4:56+8:0:1360:65535,8:mss,nop,ws::06
4:44+20:0:1360:65535,8:mss,nop,ws::02
4:48+16:0:1360:65535,8:mss,nop,ws::02

User-Agent

fingerprintco-occurrences
curl/8.14.110

Country

fingerprintco-occurrences
NL · Netherlands6
ID · Indonesia4

Network (ASN)

fingerprintco-occurrences
AS25198 · ZetServers6
AS150493 · PT Gunung Sedayu Sentosa2
AS138131 · CV. NATANETWORK SOLUTION2

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.22.1, python-httpx 0.28.1, python-requests 2.34.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog.10