The NTP Pool project is a pool of publicly available time servers, all volunteers. Time servers in the pool are usually stratum 1 or 2 servers. Although the pool consists of NTP servers worldwide, it is divided into geographical location so users can pick from a pool of time servers closest near their geographical position. The pool is probably the most used pool of NTP servers.

Using servers from the pool uses DNS load balancing to randomly assign one or more servers to synchronize to. Up to four different servers can be used. To avoid DNS caching from taking the same server more than once, additional DNS records have been created in the form of:

number.geolocation.pool.ntp.org

number be  ...