"Main problem is that com. nameservers are broken (http://marc.info/?t=120291582900002&r=1&w=2) because they returns NS records in answer section without AA flag so host utility simply use them. When you try query "correct" servers (non-authoritative data is not returned in answer section) and servers doesn't have recursion enabled this is intentional behavior of host (discussed with upstream)."
From Redhat's bugzilla: https:/ /bugzilla. redhat. com/show_ bug.cgi? id=432615
"Main problem is that com. nameservers are broken (http:// marc.info/ ?t=120291582900 002&r=1& w=2) because they returns NS records in answer section without AA flag so host utility simply use them. When you try query "correct" servers (non-authoritative data is not returned in answer section) and servers doesn't have recursion enabled this is intentional behavior of host (discussed with upstream)."
So, a bug in host seemingly.