peace885,
Hello! What are the addresses you see? It is common to see addresses that are internal to the OS being used for internal communications to the RE. Common addresses include 127.0.0.0/8 and 128.0.0.0/24. Here is an example snippet from a production MX104.
If you're interested in understanding the open ports and what processes are holding them, you may wish to jump in to shell and run 'netstat -Aa'. You can find more information here.
If you see addresses that are of concern, you can always apply a firewall filter to the Loopback interface which filters all traffic destined to the RE. More information here.
Please let me know if you have any questions. I hope this helps!