← Port Encyclopedia
866

Port-866

TCP
System Low Risk
Reserved or unassigned port 866 — may appear in network scans as open, closed, or filtered

🔍 How to Scan Port 866

nmap -sV -p 866 target
nmap -sV -sC --script=banner -p 866 target
nc -zv target 866

🛡️ Security Considerations

  • Scan port 866 with nmap -sV to identify the exact service and version
  • If Port-866 is not needed, close or firewall this port immediately
  • Check for default credentials if a management interface runs on this port
  • Use searchsploit port-866 to find known exploits
  • Monitor traffic on port 866 with Wireshark or tcpdump for anomalies
  • Ensure the service is patched to the latest version to prevent known CVE exploitation

🔗 Related System Ports

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RJE
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Discard
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systat
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Daytime
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QOTD
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Time
Port 79
Finger
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Port 113
Ident

📍 Nearby Ports

Port 861
Port-861
Port 862
Port-862
Port 863
Port-863
Port 864
Port-864
Port 865
Port-865
Port 867
Port-867
Port 868
Port-868
Port 869
Port-869
Port 870
Port-870
Port 871
Port-871
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