At first ,I think some promblems occored on our school's DNS:
> ns1.heliohost.org
Server: ns.hrbeu.edu.cn
Address: 202.118.176.2
*** ns.hrbeu.edu.cn can't find ns1.heliohost.org: Non-existent domain
>
But I tried other name nameservers they response:
Amsterdam3, Netherlands: Unknown host: ns1.heliohost.org
Amsterdam2, Netherlands: Unknown host: ns1.heliohost.org
Florida, U.S.A.: Unknown host: ns1.heliohost.org
Hong Kong, China: Unknown host: ns1.heliohost.org
Sydney, Australia: Unknown host: ns1.heliohost.org
New York, U.S.A.: Unknown host: ns1.heliohost.org
Stockholm, Sweden: Unknown host: ns1.heliohost.org
Santa Clara, U.S.A.: Unknown host: ns1.heliohost.org
Vancouver, Canada: Unknown host: ns1.heliohost.org
Krakow, Poland: Unknown host: ns1.heliohost.org
London, United Kingdom: Unknown host: ns1.heliohost.org
Austin1, U.S.A.: Unknown host: ns1.heliohost.org
Madrid, Spain: Unknown host: ns1.heliohost.org
Cagliari, Italy: Unknown host: ns1.heliohost.org
Singapore, Singapore: Unknown host: ns1.heliohost.org
Austin, U.S.A.: Unknown host: ns1.heliohost.org
Cologne, Germany: Unknown host: ns1.heliohost.org
Amsterdam, Netherlands: Unknown host: ns1.heliohost.org
Paris, France: Unknown host: ns1.heliohost.org
Shanghai, China: Unknown host: ns1.heliohost.org
Melbourne, Australia: Unknown host: ns1.heliohost.org
Copenhagen, Denmark: Unknown host: ns1.heliohost.org
Porto Alegre, Brazil: Unknown host: ns1.heliohost.org
Lille, France: Unknown host: ns1.heliohost.org
San Francisco, U.S.A.: Unknown host: ns1.heliohost.org
Chicago, U.S.A.: Unknown host: ns1.heliohost.org
Zurich, Switzerland: Unknown host: ns1.heliohost.org
Johannesburg, South Africa: Unknown host: ns1.heliohost.org
Mumbai, India: Unknown host: ns1.heliohost.org
Nagano, Japan: Unknown host: ns1.heliohost.org
Haifa, Israel: Unknown host: ns1.heliohost.org
Auckland, New Zealand: Unknown host: ns1.heliohost.org
Groningen, Netherlands: Unknown host: ns1.heliohost.org
Antwerp, Belgium: Unknown host: ns1.heliohost.org