Count of Unique Hosts in Linux

The following splunk query example will return a unique count of hosts in a given time range

*NOTE* if the host field is being autoextracted (for instance if you are using a universal forwarder) you will not need the regex command and can call upon the auto extracted fieldname of “host”

sourcetype=linux_secure |rex ".*:\d{2}\s(?<hostname>\S+)" | stats dc(hostname)
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