All ports
Port9966/UDP
odnspPort
9966
Protocol
UDP
Category
Registered
Service
odnsp
What is port 9966?
Port 9966/UDP is a Registered port, registered with IANA for specific applications. It is associated with the odnsp service.
OKI Data Network Setting Protocol
Useful commands
nmapnmap -p 9966 -sV example.comnetcatnc -zv example.com 9966curlcurl -v http://example.com:9966/telnettelnet example.com 9966bash(echo > /dev/udp/example.com/9966) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 9966/udpDeny
sudo ufw deny 9966/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 9966 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 9966 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=9966/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 9966" dir=in action=allow protocol=UDP localport=9966Security Risks
- DNS cache poisoning attacks
- DDoS amplification using open DNS resolvers
- Information disclosure of internal subdomains
- Domain hijacking if DNS server is misconfigured
Frequently Asked Questions
What service runs on port 9966/UDP?
Port 9966/UDP is associated with the odnsp service. OKI Data Network Setting Protocol
Is it safe to expose port 9966 to the Internet?
It depends on the service and configuration. Port 9966 (odnsp) 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 9966 is open?
You can use nmap: `nmap -p 9966 -sV example.com`, netcat: `nc -zv example.com 9966`, or the bash command: `(echo > /dev/udp/example.com/9966) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 9966 on my firewall?
On Linux with UFW: `sudo ufw allow 9966/udp` (open) or `sudo ufw deny 9966/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 9966 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 9966" dir=in action=allow protocol=UDP localport=9966`.
What applications and services use port 9966?
Port 9966/UDP is used by the odnsp service. Specific uses depend on the software and configuration. Check our related tools section for more information.