All ports
Port110/UDP
pop3Port
110
Protocol
UDP
Category
Well-Known
Service
pop3
What is port 110?
Port 110/UDP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the pop3 service.
Post Office Protocol - Version 3
Useful commands
nmapnmap -p 110 -sV example.comnetcatnc -zv example.com 110curlcurl -v http://example.com:110/telnettelnet example.com 110bash(echo > /dev/udp/example.com/110) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 110/udpDeny
sudo ufw deny 110/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 110 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 110 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=110/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 110" dir=in action=allow protocol=UDP localport=110Security 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- Outdated versions with vulnerabilities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 110/UDP?
Port 110/UDP is associated with the pop3 service. Post Office Protocol - Version 3
Is it safe to expose port 110 to the Internet?
It depends on the service and configuration. Port 110 (pop3) 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 110 is open?
You can use nmap: `nmap -p 110 -sV example.com`, netcat: `nc -zv example.com 110`, or the bash command: `(echo > /dev/udp/example.com/110) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 110 on my firewall?
On Linux with UFW: `sudo ufw allow 110/udp` (open) or `sudo ufw deny 110/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 110 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 110" dir=in action=allow protocol=UDP localport=110`.
What applications and services use port 110?
Port 110/UDP is used by the pop3 service. Specific uses depend on the software and configuration. Check our related tools section for more information.