IRC (alternate)
What is Port 6665?
Port 6665 is part of the standard IRC port range 6660-6669. IRC has been using this extended port range since the 1990s when the protocol moved away from the IANA-assigned port 194 due to privilege requirements on Unix systems. Many IRC clients default to trying ports 6665-6667 when connecting to an IRC network. Some IRC networks use different ports for different connection types — for instance, some may reserve certain ports for registered users while keeping others open for guest access. Port 6665 provides standard unencrypted IRC connectivity.
Common Uses
- IRC server connections
- Standard IRC client connection port
- IRC network connectivity option
- Developer community real-time chat
Technical Details
Copy-paste commands to check port 6665 (IRC (alternate)) from your terminal
Test connectivity
nc -zv example.com 6665
curl -v --max-time 5 http://example.com:6665/
telnet example.com 6665
nmap -p 6665 -sV example.com
(echo > /dev/tcp/example.com/6665) 2>/dev/null && echo "open" || echo "closed"
Open port in firewall
sudo ufw allow 6665/tcp
sudo iptables -A INPUT -p tcp --dport 6665 -j ACCEPT
sudo firewall-cmd --permanent --add-port=6665/tcp && sudo firewall-cmd --reload
Security Considerations
Unencrypted IRC connection. Prefer TLS port 6697. Apply network monitoring for unauthorized IRC activity.
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