All ports
Port73/TCP
netrjs-3Port
73
Protocol
TCP
Category
Well-Known
Service
netrjs-3
What is port 73?
Port 73/TCP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the netrjs-3 service.
Remote Job Service
Useful commands
nmapnmap -p 73 -sV example.comnetcatnc -zv example.com 73curlcurl -v http://example.com:73/telnettelnet example.com 73bash(echo > /dev/tcp/example.com/73) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 73/tcpDeny
sudo ufw deny 73/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 73 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 73 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=73/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 73" dir=in action=allow protocol=TCP localport=73Security 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- Outdated versions with vulnerabilities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 73/TCP?
Port 73/TCP is associated with the netrjs-3 service. Remote Job Service
Is it safe to expose port 73 to the Internet?
It depends on the service and configuration. Port 73 (netrjs-3) 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 73 is open?
You can use nmap: `nmap -p 73 -sV example.com`, netcat: `nc -zv example.com 73`, or the bash command: `(echo > /dev/tcp/example.com/73) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 73 on my firewall?
On Linux with UFW: `sudo ufw allow 73/tcp` (open) or `sudo ufw deny 73/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 73 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 73" dir=in action=allow protocol=TCP localport=73`.
What applications and services use port 73?
Port 73/TCP is used by the netrjs-3 service. Specific uses depend on the software and configuration. Check our related tools section for more information.