All ports
Port11211/UDP
memcachePort
11211
Protocol
UDP
Category
Registered
Service
memcache
What is port 11211?
Port 11211/UDP is a Registered port, registered with IANA for specific applications. It is associated with the memcache service.
Memory cache service
Useful commands
nmapnmap -p 11211 -sV example.comnetcatnc -zv example.com 11211curlcurl -v http://example.com:11211/telnettelnet example.com 11211bash(echo > /dev/udp/example.com/11211) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 11211/udpDeny
sudo ufw deny 11211/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 11211 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 11211 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=11211/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 11211" dir=in action=allow protocol=UDP localport=11211Security 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- Outdated versions with vulnerabilities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 11211/UDP?
Port 11211/UDP is associated with the memcache service. Memory cache service
Is it safe to expose port 11211 to the Internet?
It depends on the service and configuration. Port 11211 (memcache) 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 11211 is open?
You can use nmap: `nmap -p 11211 -sV example.com`, netcat: `nc -zv example.com 11211`, or the bash command: `(echo > /dev/udp/example.com/11211) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 11211 on my firewall?
On Linux with UFW: `sudo ufw allow 11211/udp` (open) or `sudo ufw deny 11211/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 11211 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 11211" dir=in action=allow protocol=UDP localport=11211`.
What applications and services use port 11211?
Port 11211/UDP is used by the memcache service. Specific uses depend on the software and configuration. Check our related tools section for more information.