RIPE provides services for Europe, the Middle East and parts of Asia and Africa.
ARIN, the American Registry for Internet Numbers, services North America, parts of the Caribbean, and sub-equitorial Africa.
APNIC, Asia Pacific Network Information Center, services the Asia Pacific region.
LACNIC is the Latin America and Caribbean Internet Address Registry.
ICANN, Internet Corporation for Assigned Names and Numbers.
IANA, Internet Assigned Numbers Authority.
INTERNIC, Registrar and Whois Problem Reports