← Port Encyclopedia
138

NetBIOS-DGM

UDP
Windows High Risk
NetBIOS Datagram Service — Windows datagram distribution, browsing

🔍 How to Scan Port 138

nmap -sV -p 138 target
nmap -sV -sC --script=banner -p 138 target
nc -zv target 138

🛡️ Security Considerations

  • Scan port 138 with nmap -sV to identify the exact service and version
  • If NetBIOS-DGM is not needed, close or firewall this port immediately
  • Check for default credentials if a management interface runs on this port
  • Use searchsploit netbios-dgm to find known exploits
  • Monitor traffic on port 138 with Wireshark or tcpdump for anomalies
  • Ensure the service is patched to the latest version to prevent known CVE exploitation

🔗 Related Windows Ports

Port 135
MSRPC
Port 137
NetBIOS-NS
Port 139
NetBIOS-SSN
Port 445
SMB
Port 593
MS-DCOM
Port 5357
WSDAPI
Port 5985
WinRM-HTTP
Port 5986
WinRM-HTTPS
Port 35871
SMB-Alt
Port 47001
WinRM-Alt

📍 Nearby Ports

Port 133
Port-133
Port 134
Port-134
Port 135
MSRPC
Port 136
Port-136
Port 137
NetBIOS-NS
Port 139
NetBIOS-SSN
Port 140
Port-140
Port 141
Port-141
Port 142
Port-142
Port 143
IMAP
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