All ports
Port758/UDP
nloginPort
758
Protocol
UDP
Category
Well-Known
Service
nlogin
What is port 758?
Port 758/UDP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the nlogin service.
Useful commands
nmapnmap -p 758 -sV example.comnetcatnc -zv example.com 758curlcurl -v http://example.com:758/telnettelnet example.com 758bash(echo > /dev/udp/example.com/758) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 758/udpDeny
sudo ufw deny 758/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 758 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 758 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=758/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 758" dir=in action=allow protocol=UDP localport=758Security 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- Outdated versions with vulnerabilities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 758/UDP?
Port 758/UDP is associated with the nlogin service. No detailed description is available in the IANA registry.
Is it safe to expose port 758 to the Internet?
It depends on the service and configuration. Port 758 (nlogin) 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 758 is open?
You can use nmap: `nmap -p 758 -sV example.com`, netcat: `nc -zv example.com 758`, or the bash command: `(echo > /dev/udp/example.com/758) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 758 on my firewall?
On Linux with UFW: `sudo ufw allow 758/udp` (open) or `sudo ufw deny 758/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 758 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 758" dir=in action=allow protocol=UDP localport=758`.
What applications and services use port 758?
Port 758/UDP is used by the nlogin service. Specific uses depend on the software and configuration. Check our related tools section for more information.