ccret.org.cn. 30 IN SOA www.ccret.org.cn. ccret.org.cn. ( 2008080300 ; serial 1800 ; refresh (30 minutes) 3600 ; retry (1 hour) 604800 ; expire (1 week) 3600 ; minimum (1 hour) ) ccret.org.cn. 30 IN A 67.21.93.230