All ports
Port502/UDP
mbapPort
502
Protocol
UDP
Category
Well-Known
Service
mbap
What is port 502?
Port 502/UDP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the mbap service.
Modbus Application Protocol
Useful commands
nmapnmap -p 502 -sV example.comnetcatnc -zv example.com 502curlcurl -v http://example.com:502/telnettelnet example.com 502bash(echo > /dev/udp/example.com/502) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 502/udpDeny
sudo ufw deny 502/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 502 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 502 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=502/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 502" dir=in action=allow protocol=UDP localport=502Security 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- Outdated versions with vulnerabilities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 502/UDP?
Port 502/UDP is associated with the mbap service. Modbus Application Protocol
Is it safe to expose port 502 to the Internet?
It depends on the service and configuration. Port 502 (mbap) 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 502 is open?
You can use nmap: `nmap -p 502 -sV example.com`, netcat: `nc -zv example.com 502`, or the bash command: `(echo > /dev/udp/example.com/502) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 502 on my firewall?
On Linux with UFW: `sudo ufw allow 502/udp` (open) or `sudo ufw deny 502/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 502 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 502" dir=in action=allow protocol=UDP localport=502`.
What applications and services use port 502?
Port 502/UDP is used by the mbap service. Specific uses depend on the software and configuration. Check our related tools section for more information.