All ports
Port143/TCP
imapPort
143
Protocol
TCP
Category
Well-Known
Service
imap
What is port 143?
Port 143/TCP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the imap service.
Internet Message Access Protocol
Useful commands
nmapnmap -p 143 -sV example.comnetcatnc -zv example.com 143curlcurl -v http://example.com:143/telnettelnet example.com 143bash(echo > /dev/tcp/example.com/143) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 143/tcpDeny
sudo ufw deny 143/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 143 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 143 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=143/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 143" dir=in action=allow protocol=TCP localport=143Security 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- Outdated versions with vulnerabilities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 143/TCP?
Port 143/TCP is associated with the imap service. Internet Message Access Protocol
Is it safe to expose port 143 to the Internet?
It depends on the service and configuration. Port 143 (imap) 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 143 is open?
You can use nmap: `nmap -p 143 -sV example.com`, netcat: `nc -zv example.com 143`, or the bash command: `(echo > /dev/tcp/example.com/143) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 143 on my firewall?
On Linux with UFW: `sudo ufw allow 143/tcp` (open) or `sudo ufw deny 143/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 143 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 143" dir=in action=allow protocol=TCP localport=143`.
What applications and services use port 143?
Port 143/TCP is used by the imap service. Specific uses depend on the software and configuration. Check our related tools section for more information.