Starting zone checks for tsinghua.net
Checking zone name
Resolving name-server address-> ns3.secureserver.net. 3600 IN A 216.69.185.21Checking existence of zone-> tsinghua.net. 86400 IN SOA ns3.secureserver.net. dns.jomax.net. ( 2005121800 ; Serial 28800 ; Refresh 7200 ; Retry 604800 ; Expire 86400 ) ; Minimum TTLChecking NS records-> tsinghua.net. 3600 IN NS ns25.domaincontrol.com. -> tsinghua.net. 3600 IN NS ns26.domaincontrol.com.### Warning: Origin server ns3.secureserver.net not listed in NS records
Checking nameserver authority and synchronization-> ns3.secureserver.net. 3600 IN A 216.69.185.21### Error: ns3.secureserver.net (216.69.185.21) has no reverse record [see RFC1912:2.1 for details]
Probing name server ns3.secureserver.net (216.69.185.21)-> tsinghua.net. 86400 IN SOA ns3.secureserver.net. dns.jomax.net. ( 2005121800 ; Serial 28800 ; Refresh 7200 ; Retry 604800 ; Expire 86400 ) ; Minimum TTL -> tsinghua.net. 3600 IN NS ns25.domaincontrol.com. -> tsinghua.net. 3600 IN NS ns26.domaincontrol.com.### Error: Nameserver ns26.domaincontrol.com doesn't have any valid A records
### Error: Nameserver ns25.domaincontrol.com doesn't have any valid A records
Decided to use ns3.secureserver.net (216.69.185.21) for zone check
Checking whether ns3.secureserver.net knows an A record for its own name-> ns3.secureserver.net. 3600 IN A 216.69.185.21Checking whether ns3.secureserver.net is able to reverse-map its own IP address
Checking connectivity with other nameservers
### Warning: ns3.secureserver.net is unable to resolve www.ucw.cz (maybe it's non-recursive)
### Warning: ns3.secureserver.net is unable to resolve atrey.karlin.mff.cuni.cz (maybe it's non-recursive)
### Warning: ns3.secureserver.net is unable to resolve www.google.com (maybe it's non-recursive)
Checking mapping of localhost
### Warning: ns3.secureserver.net is unable to resolve localhost [see RFC1912:4.1 for details]
### Warning: Reverse mapping of 127.0.0.1 at ns3.secureserver.net doesn't work [see RFC1912:4.1 for details]
Summary: 3 errors, 6 warnings