We pick h.root-servers.net, one of the 13 root servers (1), and ask it about shnet.pl and learn that pl is delegated to eight name servers (2), so we ask h-dns.pl where we learn that shnet.pl is delegated to two name servers, including srv0001.softhard.com.pl (3), so we ask that one and get the following answer:
Shnet.pl is a domain controlled by five domain name servers at tpsa.pl, softhard.com.pl and nask.pl having a total of five IP numbers. Two domain name servers have the same IP number. Two of them are on the same IP network. Incoming mail for shnet.pl is handled by four mail servers at softhard.com.pl. There are two duplicated IP numbers. Both are on the same IP network. Shnet.pl has one IP number (212.244.241.81), but the reverse is srv0001.softhard.com.pl.
