← Port Encyclopedia
400

Port-400

TCP
System Low Risk
Reserved or unassigned port 400 — may appear in network scans as open, closed, or filtered

🔍 How to Scan Port 400

nmap -sV -p 400 target
nmap -sV -sC --script=banner -p 400 target
nc -zv target 400

🛡️ Security Considerations

  • Scan port 400 with nmap -sV to identify the exact service and version
  • If Port-400 is not needed, close or firewall this port immediately
  • Check for default credentials if a management interface runs on this port
  • Use searchsploit port-400 to find known exploits
  • Monitor traffic on port 400 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 395
Port-395
Port 396
Port-396
Port 397
Port-397
Port 398
Port-398
Port 399
Port-399
Port 401
Port-401
Port 402
Port-402
Port 403
Port-403
Port 404
Port-404
Port 405
Port-405
📚 Learn Network Scanning — Free Course
Found this useful? Share it.
Keep going
Free coursesStructured, day-by-day tracks Free hacking labsPractice in your browser, no setup Attack SimulatorHands-on challenges in your browser
Make it count. Join free to earn XP for what you read and solve, keep a streak, and track your progress.
Join free