← Port Encyclopedia
939

Port-939

TCP
System Low Risk
Reserved or unassigned port 939 — may appear in network scans as open, closed, or filtered

🔍 How to Scan Port 939

nmap -sV -p 939 target
nmap -sV -sC --script=banner -p 939 target
nc -zv target 939

🛡️ Security Considerations

  • Scan port 939 with nmap -sV to identify the exact service and version
  • If Port-939 is not needed, close or firewall this port immediately
  • Check for default credentials if a management interface runs on this port
  • Use searchsploit port-939 to find known exploits
  • Monitor traffic on port 939 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 934
Port-934
Port 935
Port-935
Port 936
Port-936
Port 937
Port-937
Port 938
Port-938
Port 940
Port-940
Port 941
Port-941
Port 942
Port-942
Port 943
Port-943
Port 944
Port-944
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