All ports
Port223/UDP
cdcPort
223
Protocol
UDP
Category
Well-Known
Service
cdc
What is port 223?
Port 223/UDP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the cdc service.
Certificate Distribution Center
Useful commands
nmapnmap -p 223 -sV example.comnetcatnc -zv example.com 223curlcurl -v http://example.com:223/telnettelnet example.com 223bash(echo > /dev/udp/example.com/223) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 223/udpDeny
sudo ufw deny 223/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 223 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 223 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=223/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 223" dir=in action=allow protocol=UDP localport=223Security 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- Outdated versions with vulnerabilities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 223/UDP?
Port 223/UDP is associated with the cdc service. Certificate Distribution Center
Is it safe to expose port 223 to the Internet?
It depends on the service and configuration. Port 223 (cdc) 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 223 is open?
You can use nmap: `nmap -p 223 -sV example.com`, netcat: `nc -zv example.com 223`, or the bash command: `(echo > /dev/udp/example.com/223) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 223 on my firewall?
On Linux with UFW: `sudo ufw allow 223/udp` (open) or `sudo ufw deny 223/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 223 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 223" dir=in action=allow protocol=UDP localport=223`.
What applications and services use port 223?
Port 223/UDP is used by the cdc service. Specific uses depend on the software and configuration. Check our related tools section for more information.