← Port Encyclopedia
551
Port-551
TCP
System Low Risk
Reserved or unassigned port 551 — may appear in network scans as open, closed, or filtered

🔍 How to Scan Port 551

nmap -sV -p 551 target
nmap -sV -sC --script=banner -p 551 target
nc -zv target 551

🛡️ Security Considerations

  • Scan port 551 with nmap -sV to identify the exact service and version
  • If Port-551 is not needed, close or firewall this port immediately
  • Check for default credentials if a management interface runs on this port
  • Use searchsploit port-551 to find known exploits
  • Monitor traffic on port 551 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 546
Port-546
Port 547
Port-547
Port 548
AFP
Port 549
Port-549
Port 550
Port-550
Port 552
Port-552
Port 553
Port-553
Port 554
RTSP
Port 555
Port-555
Port 556
Port-556
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