ntptrace - trace a chain of NTP servers back to the primary source
ntptrace [ -n ] [ -m maxhosts ] [ server ]
ntptrace determines where a given Network Time Protocol (NTP) server
gets its time from, and follows the chain of NTP servers back to their
master time source. If given no arguments, it starts with localhost.
Here is an example of the output from ntptrace:
localhost: stratum 4, offset 0.0019529, synch distance 0.144135
server2ozo.com: stratum 2, offset 0.0124263, synch distance 0.115784
usndh.edu: stratum 1, offset 0.0019298, synch distance 0.011993, refid 'WWVB'
On each line, the fields are (left to right): the host name, the host
stratum, the time offset between that host and the local host (as mea-
sured by ntptrace; this is why it is not always zero for "localhost"),
the host synchronization distance, and (only for stratum-1 servers) the
reference clock ID. All times are given in seconds. Note that the stra-
tum is the server hop count to the primary source, while the synchro-
nization distance is the estimated error relative to the primary
source. These terms are precisely defined in RFC-1305.
-n Turns off the printing of host names; instead, host IP
addresses are given. This may be useful if a nameserver is
This program makes no attempt to improve accuracy by doing multiple
Primary source of documentation: /usr/share/doc/ntp-*
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