← Port Encyclopedia
103

Port-103

TCP
System Low Risk
Reserved or unassigned port 103 — may appear in network scans as open, closed, or filtered

🔍 How to Scan Port 103

nmap -sV -p 103 target
nmap -sV -sC --script=banner -p 103 target
nc -zv target 103

🛡️ Security Considerations

  • Scan port 103 with nmap -sV to identify the exact service and version
  • If Port-103 is not needed, close or firewall this port immediately
  • Check for default credentials if a management interface runs on this port
  • Use searchsploit port-103 to find known exploits
  • Monitor traffic on port 103 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
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Echo
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Discard
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systat
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Daytime
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QOTD
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Chargen
Port 37
Time
Port 79
Finger
Port 111
RPCbind
Port 113
Ident

📍 Nearby Ports

Port 98
Port-98
Port 99
Port-99
Port 100
Port-100
Port 101
Port-101
Port 102
ISO-TSAP
Port 104
ACR-NEMA
Port 105
Port-105
Port 106
Port-106
Port 107
Port-107
Port 108
Port-108
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