TOP TEN NTP ENUMERATION TOOLS TO DOWNLOAD

Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks. It uses UDP port 123. NTP can maintain time to within 10 ms over the public internet.  In operation since before 1985, NTP is one of the oldest Internet protocols in use. NTP was originally designed by David L. Mills of the University of Delaware, who still develops and maintains it with a team of volunteers.

For more about NTP click here
Some NTP Server commands are
ntpd
ntpq
ntptrace
ntpdc

NTP Server Scanner 

PresenTense Time Server

PresenTense Time Client 

PresenTense NTP Auditor

LAN Time Analyser 

NTP Time Server Monitor 

NTP Server Checker  

NTP Server Monitor  

Time watch  

AtomSync 

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