All ports
Port20810/TCP
crtech-nlmPort
20810
Protocol
TCP
Category
Registered
Service
crtech-nlm
What is port 20810?
Port 20810/TCP is a Registered port, registered with IANA for specific applications. It is associated with the crtech-nlm service.
CRTech NLM
Useful commands
nmapnmap -p 20810 -sV example.comnetcatnc -zv example.com 20810curlcurl -v http://example.com:20810/telnettelnet example.com 20810bash(echo > /dev/tcp/example.com/20810) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 20810/tcpDeny
sudo ufw deny 20810/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 20810 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 20810 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=20810/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 20810" dir=in action=allow protocol=TCP localport=20810Security 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- Outdated versions with vulnerabilities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 20810/TCP?
Port 20810/TCP is associated with the crtech-nlm service. CRTech NLM
Is it safe to expose port 20810 to the Internet?
It depends on the service and configuration. Port 20810 (crtech-nlm) 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 20810 is open?
You can use nmap: `nmap -p 20810 -sV example.com`, netcat: `nc -zv example.com 20810`, or the bash command: `(echo > /dev/tcp/example.com/20810) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 20810 on my firewall?
On Linux with UFW: `sudo ufw allow 20810/tcp` (open) or `sudo ufw deny 20810/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 20810 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 20810" dir=in action=allow protocol=TCP localport=20810`.
What applications and services use port 20810?
Port 20810/TCP is used by the crtech-nlm service. Specific uses depend on the software and configuration. Check our related tools section for more information.