Port 21847
netspeak-cs · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | netspeak-cs |
Frequently asked questions
What is port 21847 used for?
Port 21847 is registered with the IANA for netspeak-cs (TCP/UDP). Description: NetSpeak Corp. Connection Services.
Is port 21847 a well-known port?
No. Port 21847 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 21847 is open?
Locally on Linux with ss -tulpn | grep ':21847\b', on Windows with netstat -ano | findstr :21847. To test a remote host use Test-NetConnection <host> -Port 21847 in PowerShell or nc -zv <host> 21847 on Linux/macOS.
How do I open port 21847 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 21847/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=21847/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 21847" -Direction Inbound -Protocol TCP -LocalPort 21847 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | netspeak-cs | NetSpeak Corp. Connection Services |
| UDP | netspeak-cs | NetSpeak Corp. Connection Services |