All ports
Port753/UDP
rrhPort
753
Protocol
UDP
Category
Well-Known
Service
rrh
What is port 753?
Port 753/UDP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the rrh service.
Useful commands
nmapnmap -p 753 -sV example.comnetcatnc -zv example.com 753curlcurl -v http://example.com:753/telnettelnet example.com 753bash(echo > /dev/udp/example.com/753) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 753/udpDeny
sudo ufw deny 753/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 753 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 753 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=753/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 753" dir=in action=allow protocol=UDP localport=753Security 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- Outdated versions with vulnerabilities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 753/UDP?
Port 753/UDP is associated with the rrh service. No detailed description is available in the IANA registry.
Is it safe to expose port 753 to the Internet?
It depends on the service and configuration. Port 753 (rrh) 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 753 is open?
You can use nmap: `nmap -p 753 -sV example.com`, netcat: `nc -zv example.com 753`, or the bash command: `(echo > /dev/udp/example.com/753) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 753 on my firewall?
On Linux with UFW: `sudo ufw allow 753/udp` (open) or `sudo ufw deny 753/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 753 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 753" dir=in action=allow protocol=UDP localport=753`.
What applications and services use port 753?
Port 753/UDP is used by the rrh service. Specific uses depend on the software and configuration. Check our related tools section for more information.