All ports
Port63/UDP
whois++Port
63
Protocol
UDP
Category
Well-Known
Service
whois++
What is port 63?
Port 63/UDP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the whois++ service.
whois++
Useful commands
nmapnmap -p 63 -sV example.comnetcatnc -zv example.com 63curlcurl -v http://example.com:63/telnettelnet example.com 63bash(echo > /dev/udp/example.com/63) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 63/udpDeny
sudo ufw deny 63/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 63 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 63 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=63/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 63" dir=in action=allow protocol=UDP localport=63Security 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- Outdated versions with vulnerabilities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 63/UDP?
Port 63/UDP is associated with the whois++ service. whois++
Is it safe to expose port 63 to the Internet?
It depends on the service and configuration. Port 63 (whois++) 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 63 is open?
You can use nmap: `nmap -p 63 -sV example.com`, netcat: `nc -zv example.com 63`, or the bash command: `(echo > /dev/udp/example.com/63) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 63 on my firewall?
On Linux with UFW: `sudo ufw allow 63/udp` (open) or `sudo ufw deny 63/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 63 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 63" dir=in action=allow protocol=UDP localport=63`.
What applications and services use port 63?
Port 63/UDP is used by the whois++ service. Specific uses depend on the software and configuration. Check our related tools section for more information.