...

It has been a while since I have done anything with NTP, but I would start with ntp.org (which didn't exist when I WAS working with it) which I am led to believe has the stuff that used to be at U. Delaware, like the public servers lists:

http://support.ntp.org/bin/view/Servers/WebHome

Where I found http://support.ntp.org/bin/view/Servers/PublicTimeServer000079 -- Requiescas in pace o email Two identifying characteristics of System Administrators: Ex turpi causa non oritur actio Infallibility, and the ability to learn from their mistakes. (Adapted from Stephen Pinker)