All ports
Port91/UDP
mit-dovPort
91
Protocol
UDP
Category
Well-Known
Service
mit-dov
What is port 91?
Port 91/UDP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the mit-dov service.
MIT Dover Spooler
Useful commands
nmapnmap -p 91 -sV example.comnetcatnc -zv example.com 91curlcurl -v http://example.com:91/telnettelnet example.com 91bash(echo > /dev/udp/example.com/91) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 91/udpDeny
sudo ufw deny 91/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 91 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 91 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=91/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 91" dir=in action=allow protocol=UDP localport=91Security 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- Outdated versions with vulnerabilities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 91/UDP?
Port 91/UDP is associated with the mit-dov service. MIT Dover Spooler
Is it safe to expose port 91 to the Internet?
It depends on the service and configuration. Port 91 (mit-dov) 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 91 is open?
You can use nmap: `nmap -p 91 -sV example.com`, netcat: `nc -zv example.com 91`, or the bash command: `(echo > /dev/udp/example.com/91) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 91 on my firewall?
On Linux with UFW: `sudo ufw allow 91/udp` (open) or `sudo ufw deny 91/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 91 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 91" dir=in action=allow protocol=UDP localport=91`.
What applications and services use port 91?
Port 91/UDP is used by the mit-dov service. Specific uses depend on the software and configuration. Check our related tools section for more information.