Last Checked

Understanding Last Checked Timestamp

The Last Checked timestamp indicates when the SSL/TLS certificate’s status and properties were most recently verified by the monitoring system. This timestamp is crucial for understanding the freshness of certificate data and ensuring that any changes or issues with the certificate are detected promptly.

Monitoring Frequency and Reliability

Certificate monitoring systems typically check certificates at regular intervals:

• High-Priority Sites: May be checked hourly or every few hours
• Standard Monitoring: Often checked daily or every few days
• Low-Priority Sites: May be checked weekly
• Event-Triggered Checks: Additional checks after detected changes
• User-Initiated Checks: Manual refresh requests

Data Freshness and Decision Making

The last checked timestamp helps administrators understand how current the displayed certificate information is. If the timestamp is very recent, the data is highly reliable for making security decisions. Older timestamps may indicate that changes have occurred since the last check, such as certificate renewal, revocation, or configuration changes. Many monitoring systems provide manual refresh options to force an immediate recheck when needed. Understanding when data was last verified is essential for accurate certificate management, especially in dynamic environments where certificates may change frequently or when investigating security incidents that require current information.