All ports
Port993/TCP
imapsPort
993
Protocol
TCP
Category
Well-Known
Service
imaps
What is port 993?
Port 993/TCP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the imaps service.
IMAP over TLS protocol
Useful commands
nmapnmap -p 993 -sV example.comnetcatnc -zv example.com 993curlcurl -v http://example.com:993/telnettelnet example.com 993bash(echo > /dev/tcp/example.com/993) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 993/tcpDeny
sudo ufw deny 993/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 993 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 993 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=993/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 993" dir=in action=allow protocol=TCP localport=993Security 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- Outdated versions with vulnerabilities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 993/TCP?
Port 993/TCP is associated with the imaps service. IMAP over TLS protocol
Is it safe to expose port 993 to the Internet?
It depends on the service and configuration. Port 993 (imaps) 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 993 is open?
You can use nmap: `nmap -p 993 -sV example.com`, netcat: `nc -zv example.com 993`, or the bash command: `(echo > /dev/tcp/example.com/993) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 993 on my firewall?
On Linux with UFW: `sudo ufw allow 993/tcp` (open) or `sudo ufw deny 993/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 993 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 993" dir=in action=allow protocol=TCP localport=993`.
What applications and services use port 993?
Port 993/TCP is used by the imaps service. Specific uses depend on the software and configuration. Check our related tools section for more information.