Port Scanner

Scan the top 20 most common ports on any public host

This check runs from our infrastructure and may log the queried information to improve accuracy and availability. Logs are retained for a short period and are not used for marketing

Try:

Ports Scanned (Top 20)

21(FTP)22(SSH)23(Telnet)25(SMTP)53(DNS)80(HTTP)110(POP3)143(IMAP)443(HTTPS)445(SMB)465(SMTPS)587(Submission)993(IMAPS)995(POP3S)1433(MSSQL)3306(MySQL)3389(RDP)5432(PostgreSQL)6379(Redis)8080(HTTP-Alt)

About Port Scanning

Open

The port is accepting connections. A service is listening.

Closed

The port is reachable but no service is listening.

Filtered

A firewall is blocking access. No response received.

This tool scans public IP addresses only. Scanning private networks or without authorization may be illegal.

Related Tools

ReachabilityCheck if a host is respondingSecurity ScannerRun a full security scan on a domainWhat's My IPFind your public IP addressDNS LookupResolve a hostname before scanning

What is Port Scanning?

Port scanning identifies which network ports on a host are open and accepting connections. Each port corresponds to a specific service — for example, port 22 is SSH, port 80 is HTTP, and port 443 is HTTPS. Knowing which ports are open helps you verify your firewall rules and identify potential security risks.

This free online port scanner checks the top 20 most commonly used TCP ports on any public host. It's useful for verifying that your server's firewall is correctly configured, confirming that services are running, or troubleshooting connectivity issues. All scans are performed from our Australian data centre in Adelaide.