← Port Encyclopedia
856
Port-856
TCP
System Low Risk
Reserved or unassigned port 856 — may appear in network scans as open, closed, or filtered

🔍 How to Scan Port 856

nmap -sV -p 856 target
nmap -sV -sC --script=banner -p 856 target
nc -zv target 856

🛡️ Security Considerations

  • Scan port 856 with nmap -sV to identify the exact service and version
  • If Port-856 is not needed, close or firewall this port immediately
  • Check for default credentials if a management interface runs on this port
  • Use searchsploit port-856 to find known exploits
  • Monitor traffic on port 856 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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TCPMUX
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RJE
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Port 9
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systat
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Daytime
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QOTD
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Finger
Port 111
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📍 Nearby Ports

Port 851
Port-851
Port 852
Port-852
Port 853
Port-853
Port 854
Port-854
Port 855
Port-855
Port 857
Port-857
Port 858
Port-858
Port 859
Port-859
Port 860
Port-860
Port 861
Port-861
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