All ports
Port900/UDP
omginitialrefsPort
900
Protocol
UDP
Category
Well-Known
Service
omginitialrefs
What is port 900?
Port 900/UDP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the omginitialrefs service.
OMG Initial Refs
Useful commands
nmapnmap -p 900 -sV example.comnetcatnc -zv example.com 900curlcurl -v http://example.com:900/telnettelnet example.com 900bash(echo > /dev/udp/example.com/900) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 900/udpDeny
sudo ufw deny 900/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 900 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 900 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=900/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 900" dir=in action=allow protocol=UDP localport=900Security 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- Outdated versions with vulnerabilities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 900/UDP?
Port 900/UDP is associated with the omginitialrefs service. OMG Initial Refs
Is it safe to expose port 900 to the Internet?
It depends on the service and configuration. Port 900 (omginitialrefs) is a Well-Known 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 900 is open?
You can use nmap: `nmap -p 900 -sV example.com`, netcat: `nc -zv example.com 900`, or the bash command: `(echo > /dev/udp/example.com/900) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 900 on my firewall?
On Linux with UFW: `sudo ufw allow 900/udp` (open) or `sudo ufw deny 900/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 900 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 900" dir=in action=allow protocol=UDP localport=900`.
What applications and services use port 900?
Port 900/UDP is used by the omginitialrefs service. Specific uses depend on the software and configuration. Check our related tools section for more information.