International domain names (IDN)
If you want to make a whois-search for internationale domain names, you can use these databases:
NSI whois is a database for domain names that ends with .com or .net.
PIR whois is a database for domain names that ends with .org.
Search for other Top Level Domains
If you want to make a whois-search for other Top Level Domains, you can see an overview for administrators at IANAs website
You can use the single administrators whois-search.
