All ports
Port191/UDP
prosperoPort
191
Protocol
UDP
Category
Well-Known
Service
prospero
What is port 191?
Port 191/UDP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the prospero service.
Prospero Directory Service
Useful commands
nmapnmap -p 191 -sV example.comnetcatnc -zv example.com 191curlcurl -v http://example.com:191/telnettelnet example.com 191bash(echo > /dev/udp/example.com/191) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 191/udpDeny
sudo ufw deny 191/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 191 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 191 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=191/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 191" dir=in action=allow protocol=UDP localport=191Security 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- Outdated versions with vulnerabilities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 191/UDP?
Port 191/UDP is associated with the prospero service. Prospero Directory Service
Is it safe to expose port 191 to the Internet?
It depends on the service and configuration. Port 191 (prospero) 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 191 is open?
You can use nmap: `nmap -p 191 -sV example.com`, netcat: `nc -zv example.com 191`, or the bash command: `(echo > /dev/udp/example.com/191) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 191 on my firewall?
On Linux with UFW: `sudo ufw allow 191/udp` (open) or `sudo ufw deny 191/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 191 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 191" dir=in action=allow protocol=UDP localport=191`.
What applications and services use port 191?
Port 191/UDP is used by the prospero service. Specific uses depend on the software and configuration. Check our related tools section for more information.