← Port Encyclopedia
688

Port-688

TCP
System Low Risk
Reserved or unassigned port 688 — may appear in network scans as open, closed, or filtered

🔍 How to Scan Port 688

nmap -sV -p 688 target
nmap -sV -sC --script=banner -p 688 target
nc -zv target 688

🛡️ Security Considerations

  • Scan port 688 with nmap -sV to identify the exact service and version
  • If Port-688 is not needed, close or firewall this port immediately
  • Check for default credentials if a management interface runs on this port
  • Use searchsploit port-688 to find known exploits
  • Monitor traffic on port 688 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
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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
RPCbind
Port 113
Ident

📍 Nearby Ports

Port 683
Port-683
Port 684
Port-684
Port 685
Port-685
Port 686
Port-686
Port 687
Port-687
Port 689
Port-689
Port 690
Port-690
Port 691
MS-Exchange
Port 692
Port-692
Port 693
Port-693
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