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NTPQ(1)                              General Commands Manual                              NTPQ(1)

       ntpq - standard NTP query program

       ntpq [-inp] [-c command] [host] [...]

       The  ntpq utility program is used to monitor NTP daemon ntpd operations and determine per-
       formance. It uses the standard NTP mode 6 control message formats defined in Appendix B of
       the  NTPv3 specification RFC1305. The same formats are used in NTPv4, although some of the
       variables have changed and new ones added. The description on this page is for  the  NTPv4

       The  program  can be run either in interactive mode or controlled using command line argu-
       ments. Requests to read and write arbitrary variables  can  be  assembled,  with  raw  and
       pretty-printed  output  options being available. The ntpq can also obtain and print a list
       of peers in a common format by sending multiple queries to the server.

       If one or more request options is included on the command line when ntpq is executed, each
       of the requests will be sent to the NTP servers running on each of the hosts given as com-
       mand line arguments, or on localhost by default. If no request  options  are  given,  ntpq
       will  attempt to read commands from the standard input and execute these on the NTP server
       running on the first host given on the command line, again defaulting to localhost when no
       other host is specified. ntpq will prompt for commands if the standard input is a terminal

       ntpq uses NTP mode 6 packets to communicate with the NTP server, and hence can be used  to
       query  any compatible server on the network which permits it. Note that since NTP is a UDP
       protocol this communication will be somewhat unreliable, especially over  large  distances
       in terms of network topology. ntpq makes one attempt to retransmit requests, and will time
       requests out if the remote host is not heard from within a suitable timeout time.

       Note that in contexts where a host name is expected, a -4  qualifier  preceding  the  host
       name  forces DNS resolution to the IPv4 namespace, while a -6 qualifier forces DNS resolu-
       tion to the IPv6 namespace.

       Command line options are described following. Specifying a command line option other  than
       -i  or  -n  will  cause  the specified query (queries) to be sent to the indicated host(s)
       immediately. Otherwise, ntpq will attempt to read interactive  format  commands  from  the
       standard input.

       -4     Force DNS resolution of following host names on the command line to the IPv4 names-

       -6     Force DNS resolution of following host names on the command line to the IPv6 names-

       -c     The following argument is interpreted as an interactive format command and is added
              to the list of commands to be  executed  on  the  specified  host(s).  Multiple  -c
              options may be given.

       -i     Force  ntpq to operate in interactive mode. Prompts will be written to the standard
              output and commands read from the standard input.

       -n     Output all host addresses in dotted-quad numeric format rather than  converting  to
              the canonical host names.

       -p     Print  a list of the peers known to the server as well as a summary of their state.
              This is equivalent to the peers interactive command.

       /usr/share/doc/ntp-doc/html/ntpq.html for the full documentation.

Network Time Protocol                    November 9, 2007                                 NTPQ(1)

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