All ports
Port563/UDP
nntpsPort
563
Protocol
UDP
Category
Well-Known
Service
nntps
What is port 563?
Port 563/UDP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the nntps service.
nntp protocol over TLS/SSL (was snntp)
Useful commands
nmapnmap -p 563 -sV example.comnetcatnc -zv example.com 563curlcurl -v http://example.com:563/telnettelnet example.com 563bash(echo > /dev/udp/example.com/563) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 563/udpDeny
sudo ufw deny 563/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 563 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 563 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=563/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 563" dir=in action=allow protocol=UDP localport=563Security 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- Outdated versions with vulnerabilities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 563/UDP?
Port 563/UDP is associated with the nntps service. nntp protocol over TLS/SSL (was snntp)
Is it safe to expose port 563 to the Internet?
It depends on the service and configuration. Port 563 (nntps) 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 563 is open?
You can use nmap: `nmap -p 563 -sV example.com`, netcat: `nc -zv example.com 563`, or the bash command: `(echo > /dev/udp/example.com/563) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 563 on my firewall?
On Linux with UFW: `sudo ufw allow 563/udp` (open) or `sudo ufw deny 563/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 563 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 563" dir=in action=allow protocol=UDP localport=563`.
What applications and services use port 563?
Port 563/UDP is used by the nntps service. Specific uses depend on the software and configuration. Check our related tools section for more information.