Port 847
dhcp-failover2 · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | dhcp-failover2 |
Frequently asked questions
What is port 847 used for?
Port 847 is registered with the IANA for dhcp-failover2 (TCP/UDP). Description: dhcp-failover 2.
Is port 847 a well-known port?
Yes. Port 847 is in the range 0–1023 (system or well-known ports). On Linux and macOS only privileged processes may bind to these ports.
How do I check whether port 847 is open?
Locally on Linux with ss -tulpn | grep ':847\b', on Windows with netstat -ano | findstr :847. To test a remote host use Test-NetConnection <host> -Port 847 in PowerShell or nc -zv <host> 847 on Linux/macOS.
How do I open port 847 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 847/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=847/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 847" -Direction Inbound -Protocol TCP -LocalPort 847 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | dhcp-failover2 | dhcp-failover 2 |
| UDP | dhcp-failover2 | dhcp-failover 2 |