ns2.clinet.fi	194.100.0.11
ns1.eunet.fi	192.26.119.7
ntp1.funet.fi	193.166.5.177
ns3.inet.fi	194.89.67.242
tick.keso.fi	194.137.39.67
naula.kpo.fi	212.116.32.132
time1.mikes.fi	194.100.21.226
time2.mikes.fi	195.197.214.99
lokero.hut.fi	130.233.224.2
ntp.nasa.gov	198.123.30.132
time.nist.gov	192.43.244.18

http://www.ntp.org/
http://www.tldp.org/HOWTO/Clock.html
http://en.tldp.org/HOWTO/TimePrecision-HOWTO/