Port 4166

joost · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicejoost
Registered2007-04

Frequently asked questions

What is port 4166 used for?

Port 4166 is registered with the IANA for joost (TCP/UDP). Description: Joost Peer to Peer Protocol.

Is port 4166 a well-known port?

No. Port 4166 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 4166 is open?

Locally on Linux with ss -tulpn | grep ':4166\b', on Windows with netstat -ano | findstr :4166. To test a remote host use Test-NetConnection <host> -Port 4166 in PowerShell or nc -zv <host> 4166 on Linux/macOS.

How do I open port 4166 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 4166/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=4166/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 4166" -Direction Inbound -Protocol TCP -LocalPort 4166 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPjoostJoost Peer to Peer Protocol
UDPjoostJoost Peer to Peer Protocol

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