← Port Encyclopedia
404
Port-404
TCP
System Low Risk
Reserved or unassigned port 404 — may appear in network scans as open, closed, or filtered

🔍 How to Scan Port 404

nmap -sV -p 404 target
nmap -sV -sC --script=banner -p 404 target
nc -zv target 404

🛡️ Security Considerations

  • Scan port 404 with nmap -sV to identify the exact service and version
  • If Port-404 is not needed, close or firewall this port immediately
  • Check for default credentials if a management interface runs on this port
  • Use searchsploit port-404 to find known exploits
  • Monitor traffic on port 404 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
Port 7
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 399
Port-399
Port 400
Port-400
Port 401
Port-401
Port 402
Port-402
Port 403
Port-403
Port 405
Port-405
Port 406
Port-406
Port 407
Port-407
Port 408
Port-408
Port 409
Port-409
📚 Learn Network Scanning — Free Course