Starting zone checks for example.net
Checking zone name
Resolving name-server address
-> a.iana-servers.net. 62228 IN A 192.0.34.43
Checking existence of zone
-> example.net. 172800 IN SOA dns1.icann.org. hostmaster.icann.org. (
2009100600 ; Serial
7200 ; Refresh
3600 ; Retry
1209600 ; Expire
86400 ) ; Minimum TTL
Checking NS records
-> example.net. 172800 IN NS a.iana-servers.net.
-> example.net. 172800 IN NS b.iana-servers.net.
### Warning: Origin server dns1.icann.org not listed in NS records
Checking nameserver authority and synchronization
-> a.iana-servers.net. 62228 IN A 192.0.34.43
-> 43.34.0.192.in-addr.arpa. 21600 IN PTR a.iana-servers.net.
Probing name server a.iana-servers.net (192.0.34.43)
-> example.net. 172800 IN SOA dns1.icann.org. hostmaster.icann.org. (
2009100600 ; Serial
7200 ; Refresh
3600 ; Retry
1209600 ; Expire
86400 ) ; Minimum TTL
-> example.net. 172800 IN NS a.iana-servers.net.
-> example.net. 172800 IN NS b.iana-servers.net.
-> b.iana-servers.net. 21600 IN A 193.0.0.236
### Error: Unable to resolve 236.0.0.193.in-addr.arpa.: SERVFAIL
### Error: b.iana-servers.net (193.0.0.236) has no reverse record [see RFC1912:2.1 for details]
Probing name server b.iana-servers.net (193.0.0.236)
-> example.net. 172800 IN SOA dns1.icann.org. hostmaster.icann.org. (
2009100600 ; Serial
7200 ; Refresh
3600 ; Retry
1209600 ; Expire
86400 ) ; Minimum TTL
-> example.net. 172800 IN NS a.iana-servers.net.
-> example.net. 172800 IN NS b.iana-servers.net.
Decided to use a.iana-servers.net (192.0.34.43) for zone check
Checking whether a.iana-servers.net knows an A record for its own name
-> a.iana-servers.net. 62228 IN A 192.0.34.43
Checking whether a.iana-servers.net is able to reverse-map its own IP address
Checking mapping of localhost
### Error: Unable to resolve localhost: SERVFAIL
### Warning: a.iana-servers.net is unable to resolve localhost [see RFC1912:4.1 for details]
### Error: Unable to resolve 1.0.0.127.in-addr.arpa: SERVFAIL
### Warning: Reverse mapping of 127.0.0.1 at a.iana-servers.net doesn't work [see RFC1912:4.1 for details]
Fetching zone data for example.net
### Error: Zone transfer failed
### Fatal error: No name server available for checking