Do not assume you can use the default time servers listed by Domain Time II Server. These servers are listed as a convenience, to help you get started. You must honor the requirements posted by each time service provider. Usually nothing more than asking permission is required. Some servers have regional restrictions; others only allow specific NTP strata; others may have other requirements. It is your responsibility to ensure compliance. Time service providers operate on the honor system, and the system will only continue functioning smoothly if everyone abides by the rules.

Greyware Servers
Greyware provides time servers for its customers only. Licensed users may use them as primary and secondary time sources. You may, of course, also use these servers for testing purposes, but please do not use these servers regularly unless you are a Greyware customer!

• tick.greyware.com
  Domain Time II Server
  NTP Stratum 2
  Protocols: DT2 (UDP, TCP, DT2 over HTTP), NTP (UDP), TIME-ITP (TCP, UDP), Daytime (TCP, UDP)
  Access: Any registered customer may use this server as a time source for Domain Time Server. Please do not point individual clients at this server. Please do not check more than once per minute.

• tock.greyware.com
  Domain Time II Server
  NTP Stratum 2
  Protocols: DT2 (UDP, TCP, DT2 over HTTP), NTP (UDP), TIME-ITP (TCP, UDP), Daytime (TCP, UDP)
  Access: Any registered customer may use this server as a time source for Domain Time Server. Please do not point individual clients at this server. Please do not check more than once per minute.

Public NTP Servers
There are hundreds of NTP/SNTP servers available on the Internet. Be a good network citizen; if you have more than 100 clients on your network, your main server may qualify for connecting to a Stratum 1 server, otherwise you should pick a Stratum 2 server (pool.ntp.org may be a good choice for you, see below):

• NTP.Servers.Web (pool.ntp.org) Public Time Servers
• NIST Servers