All ports
Port505/UDP
mailbox-lmPort
505
Protocol
UDP
Category
Well-Known
Service
mailbox-lm
What is port 505?
Port 505/UDP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the mailbox-lm service.
mailbox-lm
Useful commands
nmapnmap -p 505 -sV example.comnetcatnc -zv example.com 505curlcurl -v http://example.com:505/telnettelnet example.com 505bash(echo > /dev/udp/example.com/505) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 505/udpDeny
sudo ufw deny 505/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 505 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 505 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=505/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 505" dir=in action=allow protocol=UDP localport=505Security Risks
- Open relay used for spam
- Email spoofing
- Brute force attacks against email accounts
- Information disclosure in email headers
Frequently Asked Questions
What service runs on port 505/UDP?
Port 505/UDP is associated with the mailbox-lm service. mailbox-lm
Is it safe to expose port 505 to the Internet?
It depends on the service and configuration. Port 505 (mailbox-lm) 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 505 is open?
You can use nmap: `nmap -p 505 -sV example.com`, netcat: `nc -zv example.com 505`, or the bash command: `(echo > /dev/udp/example.com/505) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 505 on my firewall?
On Linux with UFW: `sudo ufw allow 505/udp` (open) or `sudo ufw deny 505/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 505 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 505" dir=in action=allow protocol=UDP localport=505`.
What applications and services use port 505?
Port 505/UDP is used by the mailbox-lm service. Specific uses depend on the software and configuration. Check our related tools section for more information.