All ports
Port4687/UDP
nstPort
4687
Protocol
UDP
Category
Registered
Service
nst
What is port 4687?
Port 4687/UDP is a Registered port, registered with IANA for specific applications. It is associated with the nst service.
Network Scanner Tool FTP
Useful commands
nmapnmap -p 4687 -sV example.comnetcatnc -zv example.com 4687curlcurl -v http://example.com:4687/telnettelnet example.com 4687bash(echo > /dev/udp/example.com/4687) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 4687/udpDeny
sudo ufw deny 4687/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 4687 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 4687 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=4687/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 4687" dir=in action=allow protocol=UDP localport=4687Security 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- Outdated versions with vulnerabilities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 4687/UDP?
Port 4687/UDP is associated with the nst service. Network Scanner Tool FTP
Is it safe to expose port 4687 to the Internet?
It depends on the service and configuration. Port 4687 (nst) 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 4687 is open?
You can use nmap: `nmap -p 4687 -sV example.com`, netcat: `nc -zv example.com 4687`, or the bash command: `(echo > /dev/udp/example.com/4687) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 4687 on my firewall?
On Linux with UFW: `sudo ufw allow 4687/udp` (open) or `sudo ufw deny 4687/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 4687 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 4687" dir=in action=allow protocol=UDP localport=4687`.
What applications and services use port 4687?
Port 4687/UDP is used by the nst service. Specific uses depend on the software and configuration. Check our related tools section for more information.