← Port Encyclopedia
321

Port-321

TCP
System Low Risk
Reserved or unassigned port 321 — may appear in network scans as open, closed, or filtered

🔍 How to Scan Port 321

nmap -sV -p 321 target
nmap -sV -sC --script=banner -p 321 target
nc -zv target 321

🛡️ Security Considerations

  • Scan port 321 with nmap -sV to identify the exact service and version
  • If Port-321 is not needed, close or firewall this port immediately
  • Check for default credentials if a management interface runs on this port
  • Use searchsploit port-321 to find known exploits
  • Monitor traffic on port 321 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 316
Port-316
Port 317
Port-317
Port 318
TSP
Port 319
Port-319
Port 320
Port-320
Port 322
Port-322
Port 323
Port-323
Port 324
Port-324
Port 325
Port-325
Port 326
Port-326
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