All ports
Port2004/TCP
mailboxPort
2004
Protocol
TCP
Category
Registered
Service
mailbox
What is port 2004?
Port 2004/TCP is a Registered port, registered with IANA for specific applications. It is associated with the mailbox service.
Useful commands
nmapnmap -p 2004 -sV example.comnetcatnc -zv example.com 2004curlcurl -v http://example.com:2004/telnettelnet example.com 2004bash(echo > /dev/tcp/example.com/2004) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 2004/tcpDeny
sudo ufw deny 2004/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 2004 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 2004 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=2004/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 2004" dir=in action=allow protocol=TCP localport=2004Security Risks
- Open relay used for spam
- Email spoofing
- Brute force attacks against email accounts
- Information disclosure in email headers
Frequently Asked Questions
What service runs on port 2004/TCP?
Port 2004/TCP is associated with the mailbox service. No detailed description is available in the IANA registry.
Is it safe to expose port 2004 to the Internet?
It depends on the service and configuration. Port 2004 (mailbox) 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 2004 is open?
You can use nmap: `nmap -p 2004 -sV example.com`, netcat: `nc -zv example.com 2004`, or the bash command: `(echo > /dev/tcp/example.com/2004) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 2004 on my firewall?
On Linux with UFW: `sudo ufw allow 2004/tcp` (open) or `sudo ufw deny 2004/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 2004 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 2004" dir=in action=allow protocol=TCP localport=2004`.
What applications and services use port 2004?
Port 2004/TCP is used by the mailbox service. Specific uses depend on the software and configuration. Check our related tools section for more information.