All ports
Port516/TCP
videotexPort
516
Protocol
TCP
Category
Well-Known
Service
videotex
What is port 516?
Port 516/TCP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the videotex service.
videotex
Useful commands
nmapnmap -p 516 -sV example.comnetcatnc -zv example.com 516curlcurl -v http://example.com:516/telnettelnet example.com 516bash(echo > /dev/tcp/example.com/516) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 516/tcpDeny
sudo ufw deny 516/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 516 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 516 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=516/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 516" dir=in action=allow protocol=TCP localport=516Security 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- Outdated versions with vulnerabilities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 516/TCP?
Port 516/TCP is associated with the videotex service. videotex
Is it safe to expose port 516 to the Internet?
It depends on the service and configuration. Port 516 (videotex) 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 516 is open?
You can use nmap: `nmap -p 516 -sV example.com`, netcat: `nc -zv example.com 516`, or the bash command: `(echo > /dev/tcp/example.com/516) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 516 on my firewall?
On Linux with UFW: `sudo ufw allow 516/tcp` (open) or `sudo ufw deny 516/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 516 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 516" dir=in action=allow protocol=TCP localport=516`.
What applications and services use port 516?
Port 516/TCP is used by the videotex service. Specific uses depend on the software and configuration. Check our related tools section for more information.