Free NTP Servers
Discover reliable free Network Time Protocol (NTP) servers for synchronizing your device's clock. These public NTP servers provide accurate time worldwide.
NTP Pool Project
pool.ntp.org
0.pool.ntp.org
1.pool.ntp.org
Stratum 2
🌍 Worldwide
Global pool, load-balanced, volunteer-hosted servers
Google Public NTP
time.google.com
Stratum 2
🌍 Worldwide
High accuracy, global anycast network, no logging
Cloudflare Time
time.cloudflare.com
Stratum 2
🌍 Worldwide
Privacy-focused, fast, secure
NIST (US Government)
time.nist.gov
Stratum 1
🇺🇸 USA
US government atomic clock, highest precision
Ubuntu NTP
ntp.ubuntu.com
Stratum 2
🌍 Worldwide
Ubuntu-maintained, reliable for Linux systems
Apple NTP
time.apple.com
Stratum 2
🇺🇸 USA
Accurate for Apple devices (macOS, iOS)
Microsoft Windows NTP
time.windows.com
Stratum 2
🇺🇸 USA
Accurate for Windows devices, default for Windows OS
IP-Only NTP Servers
129.6.15.28
129.6.15.29
132.163.96.1
132.163.96.2
Stratum 1
🇺🇸 USA
NIST atomic clock servers - highest precision, IP addresses only
How to Use NTP Servers
- Windows: Settings > Time & Language > Additional date, time & regional settings > Set the time and date > Internet Time tab > Change settings > Use the following server.
- macOS: System Preferences > Date & Time > Date & Time tab > Set date and time automatically > Time Zone tab > Set time zone automatically.
- Linux: Use
ntpdate -s serveror configurechrony.confwithserver pool.ntp.org iburst. - Router: Access router settings (e.g., 192.168.1.1) > Advanced > Time > NTP Server.
NTP servers synchronize your clock with atomic time. Use Stratum 1 for highest accuracy. Data as of October 2025.