← Port Encyclopedia
423

Port-423

TCP
System Low Risk
Reserved or unassigned port 423 — may appear in network scans as open, closed, or filtered

🔍 How to Scan Port 423

nmap -sV -p 423 target
nmap -sV -sC --script=banner -p 423 target
nc -zv target 423

🛡️ Security Considerations

  • Scan port 423 with nmap -sV to identify the exact service and version
  • If Port-423 is not needed, close or firewall this port immediately
  • Check for default credentials if a management interface runs on this port
  • Use searchsploit port-423 to find known exploits
  • Monitor traffic on port 423 with Wireshark or tcpdump for anomalies
  • Ensure the service is patched to the latest version to prevent known CVE exploitation

🔗 Related System Ports

Port 1
TCPMUX
Port 5
RJE
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Echo
Port 9
Discard
Port 11
systat
Port 13
Daytime
Port 17
QOTD
Port 19
Chargen
Port 37
Time
Port 79
Finger
Port 111
RPCbind
Port 113
Ident

📍 Nearby Ports

Port 418
Port-418
Port 419
Port-419
Port 420
Port-420
Port 421
Port-421
Port 422
Port-422
Port 424
Port-424
Port 425
Port-425
Port 426
Port-426
Port 427
SLP
Port 428
Port-428
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