← Port Encyclopedia
509
Port-509
TCP
System Low Risk
Reserved or unassigned port 509 — may appear in network scans as open, closed, or filtered

🔍 How to Scan Port 509

nmap -sV -p 509 target
nmap -sV -sC --script=banner -p 509 target
nc -zv target 509

🛡️ Security Considerations

  • Scan port 509 with nmap -sV to identify the exact service and version
  • If Port-509 is not needed, close or firewall this port immediately
  • Check for default credentials if a management interface runs on this port
  • Use searchsploit port-509 to find known exploits
  • Monitor traffic on port 509 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 504
Port-504
Port 505
Port-505
Port 506
Port-506
Port 507
Port-507
Port 508
Port-508
Port 510
Port-510
Port 511
Port-511
Port 512
rexec
Port 513
rlogin
Port 514
Syslog
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