← Port Encyclopedia
403

Port-403

TCP
System Low Risk
Reserved or unassigned port 403 — may appear in network scans as open, closed, or filtered

🔍 How to Scan Port 403

nmap -sV -p 403 target
nmap -sV -sC --script=banner -p 403 target
nc -zv target 403

🛡️ Security Considerations

  • Scan port 403 with nmap -sV to identify the exact service and version
  • If Port-403 is not needed, close or firewall this port immediately
  • Check for default credentials if a management interface runs on this port
  • Use searchsploit port-403 to find known exploits
  • Monitor traffic on port 403 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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systat
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Port 79
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Port 111
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📍 Nearby Ports

Port 398
Port-398
Port 399
Port-399
Port 400
Port-400
Port 401
Port-401
Port 402
Port-402
Port 404
Port-404
Port 405
Port-405
Port 406
Port-406
Port 407
Port-407
Port 408
Port-408
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