All ports
Port109/UDP
pop2Port
109
Protocol
UDP
Category
Well-Known
Service
pop2
What is port 109?
Port 109/UDP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the pop2 service.
Post Office Protocol - Version 2
Useful commands
nmapnmap -p 109 -sV example.comnetcatnc -zv example.com 109curlcurl -v http://example.com:109/telnettelnet example.com 109bash(echo > /dev/udp/example.com/109) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 109/udpDeny
sudo ufw deny 109/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 109 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 109 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=109/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 109" dir=in action=allow protocol=UDP localport=109Security 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- Outdated versions with vulnerabilities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 109/UDP?
Port 109/UDP is associated with the pop2 service. Post Office Protocol - Version 2
Is it safe to expose port 109 to the Internet?
It depends on the service and configuration. Port 109 (pop2) 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 109 is open?
You can use nmap: `nmap -p 109 -sV example.com`, netcat: `nc -zv example.com 109`, or the bash command: `(echo > /dev/udp/example.com/109) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 109 on my firewall?
On Linux with UFW: `sudo ufw allow 109/udp` (open) or `sudo ufw deny 109/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 109 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 109" dir=in action=allow protocol=UDP localport=109`.
What applications and services use port 109?
Port 109/UDP is used by the pop2 service. Specific uses depend on the software and configuration. Check our related tools section for more information.