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Port Checker

Check whether specific ports on a host are open.

Network Tools
ℹ️Due to browser security restrictions, port detection is implemented through HTTP/WebSocket connection attempts, and results may not be completely accurate. Only ports supporting HTTP/HTTPS or WebSocket protocols can be detected. For precise detection, please use system-level tools like nmap.
📋 Common Ports Reference
21FTPFile Transfer Protocol
22SSHSecure Shell
23TelnetTelnet Protocol
25SMTPSimple Mail Transfer Protocol
53DNSDomain Name System
80HTTPHypertext Transfer Protocol
110POP3Post Office Protocol v3
143IMAPInternet Message Access Protocol
443HTTPSHTTP Secure
465SMTPSSMTP Secure
587SMTPMail Submission
993IMAPSIMAP Secure
995POP3SPOP3 Secure
1433MSSQLSQL Server Database
1521OracleOracle Database
3306MySQLMySQL Database
3389RDPRemote Desktop Protocol
5432PostgreSQLPostgreSQL Database
5900VNCVirtual Network Computing
6379RedisRedis Database
8080HTTP-AltHTTP Alternate Port
8443HTTPS-AltHTTPS Alternate Port
27017MongoDBMongoDB Database

What is Port Checker?

Port checker tests whether specific network ports are open on a host, useful for firewall and service verification.

Common Ports

  • 21 - FTP
  • 22 - SSH
  • 80 - HTTP
  • 443 - HTTPS
  • 3306 - MySQL
  • 5432 - PostgreSQL

Use Cases

  • Firewall testing
  • Service availability check
  • Network troubleshooting