← Port Encyclopedia
891

Port-891

TCP
System Low Risk
Reserved or unassigned port 891 — may appear in network scans as open, closed, or filtered

🔍 How to Scan Port 891

nmap -sV -p 891 target
nmap -sV -sC --script=banner -p 891 target
nc -zv target 891

🛡️ Security Considerations

  • Scan port 891 with nmap -sV to identify the exact service and version
  • If Port-891 is not needed, close or firewall this port immediately
  • Check for default credentials if a management interface runs on this port
  • Use searchsploit port-891 to find known exploits
  • Monitor traffic on port 891 with Wireshark or tcpdump for anomalies
  • Ensure the service is patched to the latest version to prevent known CVE exploitation

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TCPMUX
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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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Port 79
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📍 Nearby Ports

Port 886
Port-886
Port 887
Port-887
Port 888
Port-888
Port 889
Port-889
Port 890
Port-890
Port 892
Port-892
Port 893
Port-893
Port 894
Port-894
Port 895
Port-895
Port 896
Port-896
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