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It is referenced on this Wiki page, but it looks like the package is AWOL.
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I see it in community:
pmorris@arch:~ $ pacman -Si openntpd
Repository : community
Name : openntpd
Version : 3.9p1-4
Groups : None
Provides : None
Depends On : openssl iputils
Removes : None
Conflicts With : None
Replaces : None
Download Size : 19.70 K
Installed Size : 0.00 K
Description : Free, easy to use implementation of the Network Time Protocol.
MD5 Sum : e814752d4296e4a201a25f6abc23839d
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