This is an IDN, or International Domain Name.
The IDN system allows Internet users to use the full alphabet of their language in their domain names. They're no longer restricted to the English A-Z, and can use the full latin character set, as well as characters from other locales, including Chinese and Japanese.
Imagine how easy it is for your customers to find you in their own language!
Send email to N0SPAM.keith@websjapan.com (delete N0SPAM.) with subject line: English.net
Thanks.