Below are the common port numbers used by Splunk. However, we can change them if required.
Service Port Number Used
Splunk Web port 8000
Splunk Management port 8089
Splunk Indexing port 9997
Splunk Index Replication port 8080
Splunk Network port 514 (Used to get data from the Network port, i.e., UDP data)
KV Store 8191