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Windows Time Auditor

National Time Sources & Access Policies

PresenTense NTP Auditor references sources of legal time. Depending on your jurisdiction, the availability of legal time will vary. If you know of a source of legal time in your country which is not listed here, kindly notify us at support@bytefusion.com.

United States of America

Authority: U.S. Naval Observatory, Washington, DC
DNS: ntp2.usno.navy.mil
Service Area: USA Eastern time zone
Public Access: stratum-2 time servers only please

Authority: NASA Lewis Research Center, Cleveland, Ohio
DNS: lerc-dns.lerc.nasa.gov
Service Area: NSFNET, OARNET
Public Access: open

Authority: National Center for Atmospheric Research, Boulder, Colorado
DNS: time.nist.gov
Service Area: NSFnet, WESTnet
Public Access: stratum-2 time servers only please

Authority: NIST Boulder Laboratories, Boulder, Colorado
DNS: time-a.timefreq.bldrdoc.gov
Service Area: NSFnet, WESTnet
Public Access: stratum-2 time servers only please

Switzerland

Authority: Swiss Federal Institute. of Technology, Zurich
DNS: swisstime.ethz.ch
Service Area: Switzerland/Europe
Public Access: open

Sweden

Authority: Swedish National Testing and Research Institute, Boras
DNS: ntp1.sp.se
Service Area: Global
Public Access: open

Germany

Authority: National Institute of Natural and Engineering Sciences (PTB)
DNS: ptbtime1.ptb.de
Service Area: Europe
Public Access: open, please notify ntp-admin@ptb.de

Italy

Authority: Istituto Elettrotecnico Nazionale Galileo Ferraris, Torino
DNS: ntp1.ien.it
Service Area: Europe
Public Access: open, please notify ntp.info@ien.it

Mexico

Authority: Centro Nacional de Metrologia, Queretaro
DNS: cronos.cenam.mx
Service Area: Mexico and USA
Public Access: open