I am not sure whether I understand that question correctly, but massdns gets a list of DNS names as input and resolves those. It currently does perform hierarchical subdomain enumeration on its own (i.e. automatically enumerating subdomains of sub.example.com after having identified sub as a subdomain of example.com). However, it should not be hard to leverage massdns to perform this kind of task by creating some wrapper script.
I am not sure whether I understand that question correctly, but massdns gets a list of DNS names as input and resolves those. It currently does perform hierarchical subdomain enumeration on its own (i.e. automatically enumerating subdomains of
sub.example.comafter having identifiedsubas a subdomain ofexample.com). However, it should not be hard to leverage massdns to perform this kind of task by creating some wrapper script.