All ports
Port631/UDP
ippPort
631
Protocol
UDP
Category
Well-Known
Service
ipp
What is port 631?
Port 631/UDP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the ipp service.
IPP (Internet Printing Protocol)
Useful commands
nmapnmap -p 631 -sV example.comnetcatnc -zv example.com 631curlcurl -v http://example.com:631/telnettelnet example.com 631bash(echo > /dev/udp/example.com/631) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 631/udpDeny
sudo ufw deny 631/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 631 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 631 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=631/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 631" dir=in action=allow protocol=UDP localport=631Security 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- Outdated versions with vulnerabilities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 631/UDP?
Port 631/UDP is associated with the ipp service. IPP (Internet Printing Protocol)
Is it safe to expose port 631 to the Internet?
It depends on the service and configuration. Port 631 (ipp) 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 631 is open?
You can use nmap: `nmap -p 631 -sV example.com`, netcat: `nc -zv example.com 631`, or the bash command: `(echo > /dev/udp/example.com/631) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 631 on my firewall?
On Linux with UFW: `sudo ufw allow 631/udp` (open) or `sudo ufw deny 631/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 631 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 631" dir=in action=allow protocol=UDP localport=631`.
What applications and services use port 631?
Port 631/UDP is used by the ipp service. Specific uses depend on the software and configuration. Check our related tools section for more information.