← Port Encyclopedia
221
Port-221
TCP
System Low Risk
Reserved or unassigned port 221 — may appear in network scans as open, closed, or filtered

🔍 How to Scan Port 221

nmap -sV -p 221 target
nmap -sV -sC --script=banner -p 221 target
nc -zv target 221

🛡️ Security Considerations

  • Scan port 221 with nmap -sV to identify the exact service and version
  • If Port-221 is not needed, close or firewall this port immediately
  • Check for default credentials if a management interface runs on this port
  • Use searchsploit port-221 to find known exploits
  • Monitor traffic on port 221 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
Discard
Port 11
systat
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Daytime
Port 17
QOTD
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Chargen
Port 37
Time
Port 79
Finger
Port 111
RPCbind
Port 113
Ident

📍 Nearby Ports

Port 216
Port-216
Port 217
Port-217
Port 218
Port-218
Port 219
Port-219
Port 220
Port-220
Port 222
Port-222
Port 223
Port-223
Port 224
Port-224
Port 225
Port-225
Port 226
Port-226
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