There are different versions of host so that might be the explanation. The idea is workable, though; get the verbose (debugging) output and parse out the fields you want. But in any case, to get the name and IP address of the name servers, you will need multiple queries -- one to get the names of the name servers, and another to look up their IP addresses. (Some sites put raw IP addresses in the NS records but this is strongly discouraged.)

I think Ikon misunderstood your question, perhaps because the output format you are suggesting is somewhat misleading (perhaps it should mention that these are the IP addresses of the name servers). The pipeline could be simplified a bit but the request of A records instead of NS records is wrong anyway.

Here's what my version of host prints:

Code:

vnix$ host -t ns example.com
example.com             NS      a.iana-servers.net
example.com             NS      b.iana-servers.net

So by taking the third field from that and querying for its address, we get the name server IP addresses:

Code:

host -t ns example.com | while read dom ns server; do host -t a $server; done

Dressing it up into the format you want is left as an exercise; it can be done along the same lines.

PS. Please try to think up a helpful thread topic title next time.