Port Checker
Check if a port is open, closed, or filtered on any IP address or domain name. Free online port scanner with real-time results and common port presets.
Port Checker Tool
Common Ports Reference
| Port | Service | Protocol | Description |
|---|---|---|---|
80 |
HTTP | TCP | World Wide Web (WWW) service |
443 |
HTTPS | TCP | HTTP over TLS/SSL (secure web) |
22 |
SSH | TCP | Secure Shell remote login |
21 |
FTP | TCP | File Transfer Protocol |
25 |
SMTP | TCP | Simple Mail Transfer Protocol |
53 |
DNS | TCP/UDP | Domain Name System |
110 |
POP3 | TCP | Post Office Protocol v3 |
143 |
IMAP | TCP | Internet Message Access Protocol |
993 |
IMAPS | TCP | IMAP over SSL/TLS |
995 |
POP3S | TCP | POP3 over SSL/TLS |
3389 |
RDP | TCP | Remote Desktop Protocol |
3306 |
MySQL | TCP | MySQL database server |
5432 |
PostgreSQL | TCP | PostgreSQL database server |
6379 |
Redis | TCP | Redis database server |
27017 |
MongoDB | TCP | MongoDB database server |
Supported Address Types:
- IPv4:
192.168.1.1,8.8.8.8 - IPv6:
2001:db8::1,::1 - Domain Names:
google.com,example.com
How to Use the Port Checker
Step 1: Enter Target
Enter an IPv4 address (like 192.168.1.1), IPv6 address (like 2001:db8::1), or domain name (like example.com) in the first field.
Step 2: Specify Port
Enter a port number (1-65535) or click one of the quick-select buttons for common ports.
Step 3: Check Port
Click the "Check Port" button to test connectivity. The tool will show if the port is open, closed, or filtered.
Step 4: View Results
Review the results showing port status, response time, and timestamp. Copy any result with the copy buttons.
What is a Port Checker?
A port checker is a network utility that tests whether a specific port on a target host is open, closed, or filtered. Our tool supports both IPv4 and IPv6 addresses, as well as domain names. Ports are virtual endpoints that allow different services to communicate over a network. Each port is associated with a specific service or application.
Port checking is essential for network troubleshooting, security auditing, and service verification. It helps administrators determine if services are running correctly and if network connectivity is working as expected.
Why Use This Port Checker?
Instant Results
Get immediate feedback on port status with real-time connectivity testing.
Security Testing
Verify firewall configurations and test network security by checking port accessibility.
Network Troubleshooting
Diagnose connectivity issues and verify service availability across networks.
Common Uses for Port Checking
Network Administration
System administrators use port checkers to verify that services are running correctly, troubleshoot connectivity issues, and ensure proper firewall configuration.
Security Auditing
Security professionals check ports to identify open services, verify firewall rules, and assess network security posture.
Application Development
Developers use port checking to verify that their applications can connect to required services and troubleshoot connection issues.
Service Monitoring
IT teams monitor critical services by regularly checking if essential ports are accessible and services are responding.