All ports
Port21221/TCP
aigairserverPort
21221
Protocol
TCP
Category
Registered
Service
aigairserver
What is port 21221?
Port 21221/TCP is a Registered port, registered with IANA for specific applications. It is associated with the aigairserver service.
Services for Air Server
Useful commands
nmapnmap -p 21221 -sV example.comnetcatnc -zv example.com 21221curlcurl -v http://example.com:21221/telnettelnet example.com 21221bash(echo > /dev/tcp/example.com/21221) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 21221/tcpDeny
sudo ufw deny 21221/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 21221 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 21221 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=21221/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 21221" dir=in action=allow protocol=TCP localport=21221Security 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- Outdated versions with vulnerabilities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 21221/TCP?
Port 21221/TCP is associated with the aigairserver service. Services for Air Server
Is it safe to expose port 21221 to the Internet?
It depends on the service and configuration. Port 21221 (aigairserver) 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 21221 is open?
You can use nmap: `nmap -p 21221 -sV example.com`, netcat: `nc -zv example.com 21221`, or the bash command: `(echo > /dev/tcp/example.com/21221) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 21221 on my firewall?
On Linux with UFW: `sudo ufw allow 21221/tcp` (open) or `sudo ufw deny 21221/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 21221 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 21221" dir=in action=allow protocol=TCP localport=21221`.
What applications and services use port 21221?
Port 21221/TCP is used by the aigairserver service. Specific uses depend on the software and configuration. Check our related tools section for more information.