All ports
Port5191/UDP
aol-1Port
5191
Protocol
UDP
Category
Registered
Service
aol-1
What is port 5191?
Port 5191/UDP is a Registered port, registered with IANA for specific applications. It is associated with the aol-1 service.
AmericaOnline1
Useful commands
nmapnmap -p 5191 -sV example.comnetcatnc -zv example.com 5191curlcurl -v http://example.com:5191/telnettelnet example.com 5191bash(echo > /dev/udp/example.com/5191) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 5191/udpDeny
sudo ufw deny 5191/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 5191 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 5191 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=5191/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 5191" dir=in action=allow protocol=UDP localport=5191Security 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- Outdated versions with vulnerabilities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 5191/UDP?
Port 5191/UDP is associated with the aol-1 service. AmericaOnline1
Is it safe to expose port 5191 to the Internet?
It depends on the service and configuration. Port 5191 (aol-1) is a Registered 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 5191 is open?
You can use nmap: `nmap -p 5191 -sV example.com`, netcat: `nc -zv example.com 5191`, or the bash command: `(echo > /dev/udp/example.com/5191) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 5191 on my firewall?
On Linux with UFW: `sudo ufw allow 5191/udp` (open) or `sudo ufw deny 5191/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 5191 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 5191" dir=in action=allow protocol=UDP localport=5191`.
What applications and services use port 5191?
Port 5191/UDP is used by the aol-1 service. Specific uses depend on the software and configuration. Check our related tools section for more information.