JA4 TLS client fingerprint
t13d030900_55b375c5d22e_97f8aa674fd9
Seen 2026-09-28 to 2026-09-30 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: AS6939 sends an email when it next hits a sensor.
75
Source IPs
1
Networks
1
Countries
40
Ports hit
85
Events
75
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.