All ports
Port389/TCP
ldapPort
389
Protocol
TCP
Category
Well-Known
Service
ldap
What is port 389?
Port 389/TCP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the ldap service.
Lightweight Directory Access Protocol
Useful commands
nmapnmap -p 389 -sV example.comnetcatnc -zv example.com 389curlcurl -v http://example.com:389/telnettelnet example.com 389bash(echo > /dev/tcp/example.com/389) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 389/tcpDeny
sudo ufw deny 389/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 389 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 389 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=389/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 389" dir=in action=allow protocol=TCP localport=389Security Risks
- Unauthorized access to the service
- Data exposure if the service is unauthenticated
- Outdated versions with vulnerabilities
- Incorrect service configuration
Frequently Asked Questions
What service runs on port 389/TCP?
Port 389/TCP is associated with the ldap service. Lightweight Directory Access Protocol
Is it safe to expose port 389 to the Internet?
It depends on the service and configuration. Port 389 (ldap) is a Well-Known port. If you need to expose it, keep the service updated, use strong authentication, and configure a firewall. It's always recommended to restrict access by IP when possible.
How do I check if port 389 is open?
You can use nmap: `nmap -p 389 -sV example.com`, netcat: `nc -zv example.com 389`, or the bash command: `(echo > /dev/tcp/example.com/389) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 389 on my firewall?
On Linux with UFW: `sudo ufw allow 389/tcp` (open) or `sudo ufw deny 389/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 389 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 389" dir=in action=allow protocol=TCP localport=389`.
What applications and services use port 389?
Port 389/TCP is used by the ldap service. Specific uses depend on the software and configuration. Check our related tools section for more information.