All ports
Port1636/UDP
isdcPort
1636
Protocol
UDP
Category
Registered
Service
isdc
What is port 1636?
Port 1636/UDP is a Registered port, registered with IANA for specific applications. It is associated with the isdc service.
ISP shared public data control
Useful commands
nmapnmap -p 1636 -sV example.comnetcatnc -zv example.com 1636curlcurl -v http://example.com:1636/telnettelnet example.com 1636bash(echo > /dev/udp/example.com/1636) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 1636/udpDeny
sudo ufw deny 1636/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 1636 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 1636 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=1636/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 1636" dir=in action=allow protocol=UDP localport=1636Security 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- Outdated versions with vulnerabilities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 1636/UDP?
Port 1636/UDP is associated with the isdc service. ISP shared public data control
Is it safe to expose port 1636 to the Internet?
It depends on the service and configuration. Port 1636 (isdc) 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 1636 is open?
You can use nmap: `nmap -p 1636 -sV example.com`, netcat: `nc -zv example.com 1636`, or the bash command: `(echo > /dev/udp/example.com/1636) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 1636 on my firewall?
On Linux with UFW: `sudo ufw allow 1636/udp` (open) or `sudo ufw deny 1636/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 1636 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 1636" dir=in action=allow protocol=UDP localport=1636`.
What applications and services use port 1636?
Port 1636/UDP is used by the isdc service. Specific uses depend on the software and configuration. Check our related tools section for more information.