All ports
Port21846/TCP
netspeak-isPort
21846
Protocol
TCP
Category
Registered
Service
netspeak-is
What is port 21846?
Port 21846/TCP is a Registered port, registered with IANA for specific applications. It is associated with the netspeak-is service.
NetSpeak Corp. Directory Services
Useful commands
nmapnmap -p 21846 -sV example.comnetcatnc -zv example.com 21846curlcurl -v http://example.com:21846/telnettelnet example.com 21846bash(echo > /dev/tcp/example.com/21846) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 21846/tcpDeny
sudo ufw deny 21846/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 21846 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 21846 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=21846/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 21846" dir=in action=allow protocol=TCP localport=21846Security 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- Outdated versions with vulnerabilities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 21846/TCP?
Port 21846/TCP is associated with the netspeak-is service. NetSpeak Corp. Directory Services
Is it safe to expose port 21846 to the Internet?
It depends on the service and configuration. Port 21846 (netspeak-is) 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 21846 is open?
You can use nmap: `nmap -p 21846 -sV example.com`, netcat: `nc -zv example.com 21846`, or the bash command: `(echo > /dev/tcp/example.com/21846) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 21846 on my firewall?
On Linux with UFW: `sudo ufw allow 21846/tcp` (open) or `sudo ufw deny 21846/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 21846 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 21846" dir=in action=allow protocol=TCP localport=21846`.
What applications and services use port 21846?
Port 21846/TCP is used by the netspeak-is service. Specific uses depend on the software and configuration. Check our related tools section for more information.