Results for azzarello.users.ch :

We do not understand the query you made.

The SWITCH WHOIS Service answers for registered domains in
Top Level Domains CH and LI only.
For other Top Level Domains please consult
 http://www.iana.org/domains/root/db/

Only the characters 'a..zA..Z0..9-.' are allowed in QueryString.
No spaces or other special characters are allowed. An IDN must
be translated to its corresponding ACE string first.

For further information see the Help page of this service
using 'HELP' as 'QueryString'.