We pick e.root-servers.net, one of the 13 root servers (1), and ask it about google.com.nl and learn that nl is delegated to eight name servers (2), so we ask ns5.dns.nl where we learn that com.nl is delegated to two name servers, including ns1.com.nl (3), so we ask that one and get the following answer:
Google.com.nl is a domain controlled by two domain name servers at com.nl. Both are on different IP networks. Incoming mail for google.com.nl is handled by one mail server at 3.3. We are missing the IP:s of one server: 159.253.3.3. Google.com.nl has one IP number (159.253.3.3), but the reverse is ?.