NTP Checker

Test NTP servers online to check synchronization status, time offset, and network delay.

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About This Tool

The NTP Checker is a comprehensive online tool that allows you to test Network Time Protocol (NTP) servers in real-time. Enter any NTP server address to check its status, measure time offset from your system clock, calculate round-trip delay, and view stratum level. This tool implements the NTP protocol to communicate directly with time servers, providing accurate synchronization diagnostics for network administrators, developers, and IT professionals. No installation required - test NTP servers instantly from your browser.

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How to Use

Enter the NTP server address (e.g., pool.ntp.org or a specific IP)
Optionally customize port (default
and timeout settings
Click 'Check NTP Server' to initiate the test
View detailed results including server status, time offset, round-trip delay, and stratum level
Test multiple servers by entering new addresses and clicking again

Frequently Asked Questions

Find Quick Answers

What is NTP and why should I check NTP servers?

NTP (Network Time Protocol) is used to synchronize computer clocks over networks. Checking NTP servers helps ensure accurate time synchronization, which is critical for logging, security certificates, distributed systems, and many network services.

What do the different results mean?

Time offset shows the difference between your system clock and the NTP server time. Round-trip delay measures network latency to the server. Stratum level indicates the server's distance from reference clocks (lower is better). Status shows if the server is responding correctly.

Can I test any NTP server?

Yes, you can test any publicly accessible NTP server. Common examples include pool.ntp.org, time.google.com, or your organization's internal NTP servers. Some servers may block external queries for security reasons.

How accurate is this NTP checker?

The tool implements the standard NTP protocol to communicate directly with servers, providing accurate measurements of time offset and network delay. Accuracy depends on network conditions and server responsiveness.

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