All ports
Port75/UDP
Port
75
Protocol
UDP
Category
Well-Known
Service
Unassigned
What is port 75?
Port 75/UDP is a Well-Known port, assigned by IANA for widely recognized services. It currently has no assigned service in the IANA registry.
any private dial out service
Useful commands
nmapnmap -p 75 -sV example.comnetcatnc -zv example.com 75curlcurl -v http://example.com:75/telnettelnet example.com 75bash(echo > /dev/udp/example.com/75) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 75/udpDeny
sudo ufw deny 75/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 75 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 75 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=75/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 75" dir=in action=allow protocol=UDP localport=75Security 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- Outdated versions with vulnerabilities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 75/UDP?
Port 75/UDP is associated with the Unassigned service. any private dial out service
Is it safe to expose port 75 to the Internet?
It depends on the service and configuration. Port 75 (Unassigned) 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 75 is open?
You can use nmap: `nmap -p 75 -sV example.com`, netcat: `nc -zv example.com 75`, or the bash command: `(echo > /dev/udp/example.com/75) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 75 on my firewall?
On Linux with UFW: `sudo ufw allow 75/udp` (open) or `sudo ufw deny 75/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 75 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 75" dir=in action=allow protocol=UDP localport=75`.
What applications and services use port 75?
Port 75/UDP is used by the Unassigned service. Specific uses depend on the software and configuration. Check our related tools section for more information.