← Port Encyclopedia
639
Port-639
TCP
System Low Risk
Reserved or unassigned port 639 — may appear in network scans as open, closed, or filtered

🔍 How to Scan Port 639

nmap -sV -p 639 target
nmap -sV -sC --script=banner -p 639 target
nc -zv target 639

🛡️ Security Considerations

  • Scan port 639 with nmap -sV to identify the exact service and version
  • If Port-639 is not needed, close or firewall this port immediately
  • Check for default credentials if a management interface runs on this port
  • Use searchsploit port-639 to find known exploits
  • Monitor traffic on port 639 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
Port 13
Daytime
Port 17
QOTD
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Chargen
Port 37
Time
Port 79
Finger
Port 111
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Port 113
Ident

📍 Nearby Ports

Port 634
Port-634
Port 635
Port-635
Port 636
LDAPS
Port 637
Port-637
Port 638
Port-638
Port 640
Port-640
Port 641
Port-641
Port 642
Port-642
Port 643
Port-643
Port 644
Port-644
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