|TLD type||Generic top-level domain|
|Registry||Neulevel (90% owned by Neustar)|
|Actual use||Various uses|
|Registered domains||2,015,740 (Dec 2009)|
|Registration restrictions||No prior restriction on registration, but registrations can be challenged if registrant is not a bona-fide commercial entity|
|Structure||Registrations at second level permitted|
|Documents||ICANN registry agreement|
|Dispute policies||UDRP, Start-up Trademark Opposition Policy (STOP), Restrictions Dispute Resolution Policy (RDRP)|
biz is a generic top-level domain (gTLD) in the Domain Name System of the Internet. It is intended for registration of domains to be used by businesses. The name is a phonetic spelling of the first syllable of business.
The biz TLD was created to relieve some of the demand for domain names in the com top-level domain, and to provide an alternative for businesses whose preferred domain name in com had already been registered by another party. There are no specific legal or geographic qualifications to register a biz domain name, except that it must be for "bona fide business or commercial use". It was created in 2001 along with several other domains as the first batch of new gTLDs approved by ICANN in the expansion of the Domain Name System following the increased interest in Internet commerce in the late 1990s. The TLD is administered by NeuStar and registrations are processed via accredited registrars.
In contrast to other newly installed top-level domains, the biz registry did not implement a sunrise period to grant trademark owners first chance at registration, but instead used a procedure whereby they could file intellectual property claims in advance and then challenge any eventual registrant through a policy named Startup Trademark Opposition Policy (STOP). A number of domains were successfully obtained by trademark owners from other registrants through this policy; some of the more controversial cases, where generic words were taken over based on trademark claims in a process deemed "reverse hijacking" by critics[who?], included that of paint.biz and Canadian.biz, the latter being reversed by a court decision.
On June 23, 2008 at the ICANN 32nd International Public Meeting in Paris, the biz registry announced  that it had officially surpassed two million registrations worldwide, ranking the TLD tenth among all TLDs.
Alternative DNS roots
Before ICANN approved of the biz top-level domain in the official DNS root, similar domains of the same name were already in use by alternative DNS roots. This created the possibility of a biz domain pointing to different IP addresses depending on the specific DNS configuration of a client computer. For this reason, the domain's registry, NeuStar, requires that a DNS server be officially registered with them on their list of approved DNS servers before a domain registrar may register it in the WHOIS database.