All ports
Port4165/UDP
altcpPort
4165
Protocol
UDP
Category
Registered
Service
altcp
What is port 4165?
Port 4165/UDP is a Registered port, registered with IANA for specific applications. It is associated with the altcp service.
ArcLink over Ethernet
Useful commands
nmapnmap -p 4165 -sV example.comnetcatnc -zv example.com 4165curlcurl -v http://example.com:4165/telnettelnet example.com 4165bash(echo > /dev/udp/example.com/4165) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 4165/udpDeny
sudo ufw deny 4165/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 4165 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 4165 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=4165/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 4165" dir=in action=allow protocol=UDP localport=4165Security Risks
- Unauthorized access to the service
- Data exposure if the service is unauthenticated
- Outdated versions with vulnerabilities
- Incorrect service configuration
Frequently Asked Questions
What service runs on port 4165/UDP?
Port 4165/UDP is associated with the altcp service. ArcLink over Ethernet
Is it safe to expose port 4165 to the Internet?
It depends on the service and configuration. Port 4165 (altcp) is a Registered port. If you need to expose it, keep the service updated, use strong authentication, and configure a firewall. It's always recommended to restrict access by IP when possible.
How do I check if port 4165 is open?
You can use nmap: `nmap -p 4165 -sV example.com`, netcat: `nc -zv example.com 4165`, or the bash command: `(echo > /dev/udp/example.com/4165) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 4165 on my firewall?
On Linux with UFW: `sudo ufw allow 4165/udp` (open) or `sudo ufw deny 4165/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 4165 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 4165" dir=in action=allow protocol=UDP localport=4165`.
What applications and services use port 4165?
Port 4165/UDP is used by the altcp service. Specific uses depend on the software and configuration. Check our related tools section for more information.