All ports
Port533/UDP
netwallPort
533
Protocol
UDP
Category
Well-Known
Service
netwall
What is port 533?
Port 533/UDP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the netwall service.
for emergency broadcasts
Useful commands
nmapnmap -p 533 -sV example.comnetcatnc -zv example.com 533curlcurl -v http://example.com:533/telnettelnet example.com 533bash(echo > /dev/udp/example.com/533) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 533/udpDeny
sudo ufw deny 533/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 533 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 533 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=533/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 533" dir=in action=allow protocol=UDP localport=533Security 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- Outdated versions with vulnerabilities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 533/UDP?
Port 533/UDP is associated with the netwall service. for emergency broadcasts
Is it safe to expose port 533 to the Internet?
It depends on the service and configuration. Port 533 (netwall) 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 533 is open?
You can use nmap: `nmap -p 533 -sV example.com`, netcat: `nc -zv example.com 533`, or the bash command: `(echo > /dev/udp/example.com/533) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 533 on my firewall?
On Linux with UFW: `sudo ufw allow 533/udp` (open) or `sudo ufw deny 533/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 533 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 533" dir=in action=allow protocol=UDP localport=533`.
What applications and services use port 533?
Port 533/UDP is used by the netwall service. Specific uses depend on the software and configuration. Check our related tools section for more information.