JA4 TLS client fingerprint
t12i520600_3874cc0afe49_d74d77c6171b
Seen 2026-02-22 to 2026-09-23 across the retained window.
The feed is a URL your firewall, MISP or SIEM polls; it needs a free account so it can be revoked. Or watch the top network: AS396982 sends an email when it next hits a sensor.
124
Source IPs
1
Networks
2
Countries
123
Ports hit
129
Events
124
IPs / network
This fingerprint is concentrated: many addresses on very few networks, which is what a single coordinated operation tends to look like.
Top networks
Countries
What it requests
User agents claimed
About this fingerprint
JA4 is a fingerprint of the TLS Client Hello: the version, cipher suites, extensions and signature algorithms a client offers when it opens an HTTPS connection. Clients built on the same library and version produce the same JA4, which makes it a durable handle on the tool behind the traffic.