All ports
Port4646/TCP
dots-signalPort
4646
Protocol
TCP
Category
Registered
Service
dots-signal
What is port 4646?
Port 4646/TCP is a Registered port, registered with IANA for specific applications. It is associated with the dots-signal service.
Distributed Denial-of-Service Open Threat Signaling (DOTS) Signal Channel Protocol. The service name is used to construct the SRV service names "_dots-signal._udp" and "_dots-signal._tcp" for discovering DOTS servers used to establish DOTS signal channel.
Useful commands
nmapnmap -p 4646 -sV example.comnetcatnc -zv example.com 4646curlcurl -v http://example.com:4646/telnettelnet example.com 4646bash(echo > /dev/tcp/example.com/4646) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 4646/tcpDeny
sudo ufw deny 4646/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 4646 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 4646 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=4646/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 4646" dir=in action=allow protocol=TCP localport=4646Security 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- Outdated versions with vulnerabilities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 4646/TCP?
Port 4646/TCP is associated with the dots-signal service. Distributed Denial-of-Service Open Threat Signaling (DOTS) Signal Channel Protocol. The service name is used to construct the SRV service names "_dots-signal._udp" and "_dots-signal._tcp" for discovering DOTS servers used to establish DOTS signal channel.
Is it safe to expose port 4646 to the Internet?
It depends on the service and configuration. Port 4646 (dots-signal) 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 4646 is open?
You can use nmap: `nmap -p 4646 -sV example.com`, netcat: `nc -zv example.com 4646`, or the bash command: `(echo > /dev/tcp/example.com/4646) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 4646 on my firewall?
On Linux with UFW: `sudo ufw allow 4646/tcp` (open) or `sudo ufw deny 4646/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 4646 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 4646" dir=in action=allow protocol=TCP localport=4646`.
What applications and services use port 4646?
Port 4646/TCP is used by the dots-signal service. Specific uses depend on the software and configuration. Check our related tools section for more information.