All our domain name software tools include a diagnostic port 43 whois lookup tool available under the Tools > Popup Whois Tool menu. You can use this to quickly lookup a domain name or check if port 43 connections are working properly.
To check a domain name type in the whois server and the domain name into the appropriate boxes and then click 'Go'.
In some cases you can use the whois tool to determine the valid whois server for a country or top level domain by querying whois.iana.org. For example to find the whois server for query whois.iana.org for it. Now look through the whois output and you will find the whois server listed as
Whois Server (port 43): whois.nic.it
