All ports
Port4740/UDP
ipfixsPort
4740
Protocol
UDP
Category
Registered
Service
ipfixs
What is port 4740?
Port 4740/UDP is a Registered port, registered with IANA for specific applications. It is associated with the ipfixs service.
ipfix protocol over DTLS
Useful commands
nmapnmap -p 4740 -sV example.comnetcatnc -zv example.com 4740curlcurl -v http://example.com:4740/telnettelnet example.com 4740bash(echo > /dev/udp/example.com/4740) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 4740/udpDeny
sudo ufw deny 4740/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 4740 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 4740 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=4740/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 4740" dir=in action=allow protocol=UDP localport=4740Security 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- Outdated versions with vulnerabilities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 4740/UDP?
Port 4740/UDP is associated with the ipfixs service. ipfix protocol over DTLS
Is it safe to expose port 4740 to the Internet?
It depends on the service and configuration. Port 4740 (ipfixs) 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 4740 is open?
You can use nmap: `nmap -p 4740 -sV example.com`, netcat: `nc -zv example.com 4740`, or the bash command: `(echo > /dev/udp/example.com/4740) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 4740 on my firewall?
On Linux with UFW: `sudo ufw allow 4740/udp` (open) or `sudo ufw deny 4740/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 4740 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 4740" dir=in action=allow protocol=UDP localport=4740`.
What applications and services use port 4740?
Port 4740/UDP is used by the ipfixs service. Specific uses depend on the software and configuration. Check our related tools section for more information.