I'd like to query the DNS records until get the right domain name.
For instance, given www.subdomain.site.com.br, be able to dig from .br until site.com.br.
Which is the most (protocol-speaking) way to achieve that? An recipe using dig/nslookup would be best.
Thanks.
dig +trace www.subdomain.site.com.br
will show you exactly what happens.
dig www.mysite.domain.com @a.root-servers.net
you'll get the next level from there. Just replace the portion after the '@' and keep recursing until you query a server that gives an answer rather than additional information