Monitor any specific port on your server.

UptimeRobot supports monitoring any TCP port, including standard ports for web servers, email services, databases, DNS, SSH, FTP, and custom applications.

Common examples include:

• 80 and 443 for HTTP and HTTPS
• 22 for SSH
• 25, 465, and 587 for SMTP
• 3306 for MySQL
• 5432 for PostgreSQL

If your service uses a non-standard port, you can enter any custom TCP port manually when creating the monitor.

Port monitoring checks whether a specific service is accepting TCP connections on a given port. Ping monitoring checks whether the server itself is reachable over the network using ICMP.

A server can still respond to ping requests while services like SSH, databases, or mail servers are down. Port monitoring goes one step further by verifying that the actual service behind the port is running and accessible.

For broader visibility, many teams use both ping and port monitoring together.

Monitor any service your users, applications, or infrastructure depend on. Common examples include:

• Web servers on ports 80 and 443
• SSH on port 22
• SMTP, IMAP, and POP3 email services
• Databases like MySQL and PostgreSQL
• DNS services on port 53

Port monitoring detects when a service stops accepting connections, even if the server itself is still online.

Yes, port monitoring is a reliable way to monitor mail server availability. UptimeRobot supports SMTP (25, 465, 587), IMAP (143, 993), and POP3 (110, 995) ports.

If any of those services stops accepting connections, you receive an alert immediately. Email issues often go unnoticed longer than website outages, so monitoring mail ports directly helps catch problems earlier.

To create a port monitor in UptimeRobot, enter the hostname or IP address of your server, specify the TCP port you want to check, and choose how often the monitor should run.

You can also configure alert integrations like email, Slack, Microsoft Teams, SMS, or PagerDuty notifications. When the monitor is saved, UptimeRobot starts checking the port automatically and alerts you if the service stops accepting connections.

Yes, UptimeRobot includes free port monitoring with automatic uptime checks, response time tracking, and email alerts.

Paid plans add faster monitoring intervals, more monitors, and additional notification integrations like Slack, Microsoft Teams, SMS, voice calls, and PagerDuty alerts.

Yes, each port monitor checks one specific server and TCP port combination, so monitoring multiple ports on the same server requires separate monitors.

For instance, you can monitor HTTPS on port 443, SSH on port 22, and MySQL on port 3306 at the same time. Each monitor runs independently and sends alerts separately, making it easier to identify which service is affected.