From which devices can I see the ftp login logs with usernames?

[samsingnok]

From which devices (ex: ips, firewall) can I see the ftp login logs with usernames?

Thanks in advance

[lukejadamec]

You can see the logins from any device that logs the login data with usernames provided those logs are indexed by Splunk.
If you need help building a search, then you should post some sample events that contain the login data from the various devices.