IRC (alternate)
What is Port 6663?
Port 6663 is part of the standard IRC port range 6660-6669 used by IRC servers for client connections. IRC networks configure their servers to accept connections on multiple ports to provide redundancy and accommodate different network environments. Some corporate and educational firewalls may block specific ports, so having multiple options helps IRC users connect. The port provides the same unencrypted IRC functionality as other ports in the range. IRC continues to serve as real-time communication infrastructure for technical projects and communities that value open protocols and decentralization.
Common Uses
- IRC server connections
- Alternative IRC connection endpoint
- IRC client fallback connection
- Technical community communication
Technical Details
Copy-paste commands to check port 6663 (IRC (alternate)) from your terminal
Test connectivity
nc -zv example.com 6663
curl -v --max-time 5 http://example.com:6663/
telnet example.com 6663
nmap -p 6663 -sV example.com
(echo > /dev/tcp/example.com/6663) 2>/dev/null && echo "open" || echo "closed"
Open port in firewall
sudo ufw allow 6663/tcp
sudo iptables -A INPUT -p tcp --dport 6663 -j ACCEPT
sudo firewall-cmd --permanent --add-port=6663/tcp && sudo firewall-cmd --reload
Security Considerations
Unencrypted. Use TLS-enabled port 6697. Monitor for unauthorized IRC traffic which may indicate compromise.
Popular Ports Reference
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