ntpdc(1) on Linux
The text 2c18573de652, as Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it.
special NTP query program
Flags it lists
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-4 -
-6 -
-c -
-i -
-l -
-n -
-p -
-s