All ports
Port1983/UDP
lhtpPort
1983
Protocol
UDP
Category
Registered
Service
lhtp
What is port 1983?
Port 1983/UDP is a Registered port, registered with IANA for specific applications. It is associated with the lhtp service.
Loophole Test Protocol
Useful commands
nmapnmap -p 1983 -sV example.comnetcatnc -zv example.com 1983curlcurl -v http://example.com:1983/telnettelnet example.com 1983bash(echo > /dev/udp/example.com/1983) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 1983/udpDeny
sudo ufw deny 1983/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 1983 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 1983 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=1983/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 1983" dir=in action=allow protocol=UDP localport=1983Security 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- Outdated versions with vulnerabilities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 1983/UDP?
Port 1983/UDP is associated with the lhtp service. Loophole Test Protocol
Is it safe to expose port 1983 to the Internet?
It depends on the service and configuration. Port 1983 (lhtp) 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 1983 is open?
You can use nmap: `nmap -p 1983 -sV example.com`, netcat: `nc -zv example.com 1983`, or the bash command: `(echo > /dev/udp/example.com/1983) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 1983 on my firewall?
On Linux with UFW: `sudo ufw allow 1983/udp` (open) or `sudo ufw deny 1983/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 1983 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 1983" dir=in action=allow protocol=UDP localport=1983`.
What applications and services use port 1983?
Port 1983/UDP is used by the lhtp service. Specific uses depend on the software and configuration. Check our related tools section for more information.