← Port Encyclopedia
420
Port-420
TCP
System Low Risk
Reserved or unassigned port 420 — may appear in network scans as open, closed, or filtered

🔍 How to Scan Port 420

nmap -sV -p 420 target
nmap -sV -sC --script=banner -p 420 target
nc -zv target 420

🛡️ Security Considerations

  • Scan port 420 with nmap -sV to identify the exact service and version
  • If Port-420 is not needed, close or firewall this port immediately
  • Check for default credentials if a management interface runs on this port
  • Use searchsploit port-420 to find known exploits
  • Monitor traffic on port 420 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
Port 5
RJE
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Echo
Port 9
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systat
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Daytime
Port 17
QOTD
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Port 37
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Port 79
Finger
Port 111
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Port 113
Ident

📍 Nearby Ports

Port 415
Port-415
Port 416
Port-416
Port 417
Port-417
Port 418
Port-418
Port 419
Port-419
Port 421
Port-421
Port 422
Port-422
Port 423
Port-423
Port 424
Port-424
Port 425
Port-425
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