All ports
Port21849/UDP
netspeak-cpsPort
21849
Protocol
UDP
Category
Registered
Service
netspeak-cps
What is port 21849?
Port 21849/UDP is a Registered port, registered with IANA for specific applications. It is associated with the netspeak-cps service.
NetSpeak Corp. Credit Processing System
Useful commands
nmapnmap -p 21849 -sV example.comnetcatnc -zv example.com 21849curlcurl -v http://example.com:21849/telnettelnet example.com 21849bash(echo > /dev/udp/example.com/21849) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 21849/udpDeny
sudo ufw deny 21849/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 21849 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 21849 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=21849/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 21849" dir=in action=allow protocol=UDP localport=21849Security 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- Outdated versions with vulnerabilities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 21849/UDP?
Port 21849/UDP is associated with the netspeak-cps service. NetSpeak Corp. Credit Processing System
Is it safe to expose port 21849 to the Internet?
It depends on the service and configuration. Port 21849 (netspeak-cps) 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 21849 is open?
You can use nmap: `nmap -p 21849 -sV example.com`, netcat: `nc -zv example.com 21849`, or the bash command: `(echo > /dev/udp/example.com/21849) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 21849 on my firewall?
On Linux with UFW: `sudo ufw allow 21849/udp` (open) or `sudo ufw deny 21849/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 21849 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 21849" dir=in action=allow protocol=UDP localport=21849`.
What applications and services use port 21849?
Port 21849/UDP is used by the netspeak-cps service. Specific uses depend on the software and configuration. Check our related tools section for more information.