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SNTP Client in C#

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4.88/5 (38 votes)

Mar 14, 2001

CPOL
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Implementation of the Simple Network Time Protocol (RFC 2030) in C#

  • Download source files - 12 Kb
  • Download demo project - 5 Kb

    Sample Image - ntpclient.jpg

    Introduction

    Though not obvious, time synchronization is sometimes important. The best example is the Kerberos authentication protocol, which requires the resources to be synchronized within minutes or even seconds, but there are other situations as well. The Network Time Protocol (NTP) and its simplified form (SNTP) are widely used to synchronize network resources, due to their simplicity and effectiveness. There are many programs available that synchronize your PC's clock with that of a time server. Dimension 4 is my favorite.

    In case you need time synchronization embedded into your software, here is the C# alternative. It's simple, fast and integrates seamlessly with the .NET platform. There is a Java implementation of a NTP client by Michel Van den Bergh, but I don't have the URL anymore. Maybe Michel reads this and will send me a note.

    There are several time severs on the Internet and the list below contains those operated by NIST. If you need more, use a search engine.

    Name IP Address Location
    time-a.nist.gov 129.6.15.28 NIST, Gaithersburg, Maryland
    time-b.nist.gov 129.6.15.29 NIST, Gaithersburg, Maryland
    time-a.timefreq.bldrdoc.gov 132.163.4.101 NIST, Boulder, Colorado
    time-b.timefreq.bldrdoc.gov 132.163.4.102 NIST, Boulder, Colorado
    time-c.timefreq.bldrdoc.gov 132.163.4.103 NIST, Boulder, Colorado
    utcnist.colorado.edu 128.138.140.44 University of Colorado, Boulder
    time.nist.gov 192.43.244.18 NCAR, Boulder, Colorado
    time-nw.nist.gov 131.107.1.10 Microsoft, Redmond, Washington
    nist1.datum.com 209.0.72.7 Datum, San Jose, California
    nist1.dc.certifiedtime.com 216.200.93.8 Abovnet, Virginia
    nist1.nyc.certifiedtime.com 208.184.49.9 Abovnet, New York City
    nist1.sjc.certifiedtime.com 208.185.146.41 Abovnet, San Jose, California