# アマノセキュアジャパン(e-timing): https://www.e-timing.ne.jp/product/timestamp/open-server/
DOMAIN-SUFFIX,ats1.e-timing.ne.jp 

# INTERNET MULTIFEED: https://www.mfeed.ad.jp/ntp/detail.html
DOMAIN-SUFFIX,ntp.jst.mfeed.ad.jp 
DOMAIN-SUFFIX,ntp1.jst.mfeed.ad.jp 
DOMAIN-SUFFIX,ntp2.jst.mfeed.ad.jp 
DOMAIN-SUFFIX,ntp3.jst.mfeed.ad.jp 
DOMAIN-SUFFIX,ntp1.v6.mfeed.ad.jp 
DOMAIN-SUFFIX,ntp2.v6.mfeed.ad.jp 
DOMAIN-SUFFIX,ntp3.v6.mfeed.ad.jp 

# 国立天文台水沢 https://www.miz.nao.ac.jp/vlbi/ntp.html
DOMAIN-SUFFIX,s2csntp.miz.nao.ac.jp 

# 情報通信研究機構(NICT): https://jjy.nict.go.jp/tsp/PubNtp/index.html
DOMAIN-SUFFIX,ntp.nict.jp 

# OCN: https://www.ntt.com/business/services/network/internet-connect/ocn-business/ocn/customer/set_up/tech_1.html
DOMAIN-SUFFIX,ntp-tk01.ocn.ad.jp 
DOMAIN-SUFFIX,ntp-tk02.ocn.ad.jp 
DOMAIN-SUFFIX,ntp-os01.ocn.ad.jp 

# plala: https://mainte.plala.or.jp/support/manual/internet/setup/
DOMAIN-SUFFIX,ntp1.plala.or.jp 
DOMAIN-SUFFIX,ntp2.plala.or.jp 

# Ring Server Project: http://www.ring.gr.jp/ring/ntp.html.ja
DOMAIN-SUFFIX,ntp.ring.gr.jp 
DOMAIN-SUFFIX,ntp0.ring.gr.jp 
DOMAIN-SUFFIX,ntp1.ring.gr.jp 
DOMAIN-SUFFIX,ntp2.ring.gr.jp 
DOMAIN-SUFFIX,ntp.t.ring.gr.jp 
DOMAIN-SUFFIX,ntp.dnsbalance.ring.gr.jp 

# 東京大学(The University of Tokyo)
DOMAIN-SUFFIX,ntp.nc.u-tokyo.ac.jp 

# 東北大学(TOHOKU UNIVERSITY): https://www.tains.tohoku.ac.jp/contents/information/server-info.html
DOMAIN-SUFFIX,ntp.tohoku.ac.jp 
DOMAIN-SUFFIX,ntp1.tohoku.ac.jp 
DOMAIN-SUFFIX,ntp2.tohoku.ac.jp 

# 豊橋技術科学大学(Toyohashi University of Technology): https://imc.tut.ac.jp/misc/
DOMAIN-SUFFIX,ntp.tut.ac.jp 

# WAKWAK: https://www.wakwak.com/prl/support/g_internet/server_wakwak.html
DOMAIN-SUFFIX,ntp1.wakwak.com 
DOMAIN-SUFFIX,ntp2.wakwak.com