When checking if a listener is active or not in Oracle:
lsnrctl status
This command should return something similar to the following. Check-out the Services summary:
Services Summary…
Service “PLSExtProc” has 1 instance(s).
Instance “PLSExtProc”, status UNKNOWN, has 1 handler(s) for this service…
Service “domain.name.com” has 1 instance(s).
Instance “dmcl”, status READY, has 3 handler(s) for this service…
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