Some servers does not provide A records for nameservers.
missing A record(s) for (ns3.etecsa.net.cu,ns1.etecsa.net,ns2.etecsa.net.cu,ns2.etecsa.net,ns4.etecsa.net,ns3.etecsa.net,ns5.etecsa.net,ns5.etecsa.net.cu,ns4.etecsa.net.cu,ns1.etecsa.net.cu) at nameserver 200.55.128.3
missing A record(s) for (ns2.etecsa.net,ns2.etecsa.net.cu,ns3.etecsa.net.cu,ns3.etecsa.net,ns4.etecsa.net,ns4.etecsa.net.cu,ns1.etecsa.net,ns5.etecsa.net,ns1.etecsa.net.cu,ns5.etecsa.net.cu) at nameserver 200.55.128.4
missing A record(s) for (ns2.etecsa.net.cu,ns3.etecsa.net.cu,ns3.etecsa.net,ns4.etecsa.net.cu,ns2.etecsa.net,ns5.etecsa.net.cu,ns1.etecsa.net,ns5.etecsa.net,ns4.etecsa.net,ns1.etecsa.net.cu) at nameserver 200.55.128.10
missing A record(s) for (ns5.etecsa.net,ns3.etecsa.net,ns3.etecsa.net.cu,ns1.etecsa.net.cu,ns1.etecsa.net,ns2.etecsa.net.cu,ns5.etecsa.net.cu,ns4.etecsa.net,ns4.etecsa.net.cu,ns2.etecsa.net) at nameserver 200.55.128.11