JA4 TLS client fingerprint
t13i870900_72303a6ce03a_5ac7197df9d2
Seen 2026-02-23 to 2026-10-14 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: AS21859 sends an email when it next hits a sensor.
21
Source IPs
2
Networks
1
Countries
3
Ports hit
26
Events
10
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
Ports targeted
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.