All ports
Port4333/UDP
ahspPort
4333
Protocol
UDP
Category
Registered
Service
ahsp
What is port 4333?
Port 4333/UDP is a Registered port, registered with IANA for specific applications. It is associated with the ahsp service.
ArrowHead Service Protocol (AHSP)
Useful commands
nmapnmap -p 4333 -sV example.comnetcatnc -zv example.com 4333curlcurl -v http://example.com:4333/telnettelnet example.com 4333bash(echo > /dev/udp/example.com/4333) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 4333/udpDeny
sudo ufw deny 4333/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 4333 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 4333 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=4333/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 4333" dir=in action=allow protocol=UDP localport=4333Security 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- Outdated versions with vulnerabilities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 4333/UDP?
Port 4333/UDP is associated with the ahsp service. ArrowHead Service Protocol (AHSP)
Is it safe to expose port 4333 to the Internet?
It depends on the service and configuration. Port 4333 (ahsp) 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 4333 is open?
You can use nmap: `nmap -p 4333 -sV example.com`, netcat: `nc -zv example.com 4333`, or the bash command: `(echo > /dev/udp/example.com/4333) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 4333 on my firewall?
On Linux with UFW: `sudo ufw allow 4333/udp` (open) or `sudo ufw deny 4333/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 4333 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 4333" dir=in action=allow protocol=UDP localport=4333`.
What applications and services use port 4333?
Port 4333/UDP is used by the ahsp service. Specific uses depend on the software and configuration. Check our related tools section for more information.