[ntp:questions] Query NTP status on windows7

Charles Elliott elliott.ch at comcast.net
Tue Sep 20 16:43:30 UTC 2016

First of all, please, you should never ask a question about computers

stating what your platform is, O/S and version, CPU, and memory size.  When 

asking a question about NTPD, you should state what version you are using.


Second, people can help more if you tell them what you are trying to do, 

what your goal is.


Third, it would help if you would identify yourself, name and organization, 

or at least organization type.  I, for one, am opposed to giving advice to 



All that being said, I used the ntpq program, which is in the ntp/bin

for something similar to what you want.  The documentation for ntpq is in 

ntp/doc/HTML/ntpq.html.  I was working in Java, so I used the ProcessBuilder

class to start ntpq and pipe its output back to my program.  I issued the 

host command to ntpq to set the IP address of the queried computer.  Then 

I repeatedly issued the peers command and parsed the output, which is:


ntpq> peers

     remote           refid      st t when poll reach   delay   offset


FreeNAS    3 u   14   16    7    0.257   -0.353

+  .CDMA.           1 u   13   16    7   16.499    1.689

-time-c.nist.gov .ACTS.           1 u   13   16    5   87.567   34.167

-time-d.nist.gov .ACTS.           1 u   13   16    5   86.541   34.231

-bonehed.lcs.mit .CDMA.           1 u    9   16    7   24.862    1.969

-timelord.w1nr.n   2 u    9   16    7   13.593   -0.543

+ntp1.conectiv.c .IRIG.           1 u   13   16    7   22.165   -0.793

-lookingglass.ed   2 u    7   16    7   16.441   -1.988

*time.falk.us    .GPS.            1 u    8   16    7   24.969   -0.128


The first column is the tally code.  The '*' is the server synced to, '+'
are sync 

candidates, and '-' means discarded by the cluster algorithm.  Space ' ' 

means designated no select, in my case.


An easier way, according to the documentation, is to issue the rv 0 command
to ntpq, 

where 0 stands for system variables, and rv means readvar or read variables.

typical return is:


ntpq> rv 0

associd=0 status=0615 leap_none, sync_ntp, 1 event, clock_sync,

version="ntpd 4.2.8p8 at 1.3265-o Jun 18 15:51:19.34 (UTC+01:00) 2016  (1)",

processor="x86-SSE2", system="Windows", leap=00, stratum=2,

precision=-22, rootdelay=12.119, rootdisp=2.987, refid=,

reftime=db8be1e9.5be1a5a3  Tue, Sep 20 2016 12:27:21.358,

clock=db8be1eb.c0fab301  Tue, Sep 20 2016 12:27:23.753, peer=37206, tc=5,

mintc=3, offset=0.132622, frequency=-15.726, sys_jitter=0.382788,

clk_jitter=0.754, clk_wander=0.021, tai=36, leapsec=201507010000,



According to the documentation "clock_sync" means the system is synchronized

and "refid" is the peer synced to, but I have never personally used these 

for this purpose.  The status word is described in decode.html and 

might possibly be useful to you.


Charles Elliott


-----Original Message-----
From: questions
[mailto:questions-bounces+elliott.ch=comcast.net at lists.ntp.org] On Behalf Of
sneha b
Sent: Tuesday, September 20, 2016 6:49 AM
To: questions at lists.ntp.org
Subject: [ntp:questions] Query NTP status on windows7




Is there a way to find out whether the sync was successful or not.

In vxworks we have ipsntp_query_time, is there something similar to this so
that I can use it programmatically and return success/failure.




questions mailing list

 <mailto:questions at lists.ntp.org> questions at lists.ntp.org


More information about the questions mailing list