Unlimited registrations is available in the following zones. Registration will be available freely to all parties worldwide, and there are no nexus or other qualifications:

•  .in co.in net.in org.in firm.in gen.in (general)
•  ind.in (individuals)

The following zones are reserved for use by qualified organizations in India.

•  ac.in (Academic) res.in (Indian research institutes) gov.in (Indian government)
•  mil.in (Indian Military)

GENERAL REGISTRATION POLICIES

•  Term: domain names may be registered for a minimum of one (1) year, and a maximum  of five (5) years.
•  Autorenewal:Domains automatically renew at the end of their term (the expiration date).
•  .IN domain names may be between 3 and 63 characters in length.
   Only letters, digits, and hyphens will be accepted in a domain name. Names cannot begin or  end with hyphens.
•  Contact information: Registrants must provide true, accurate contact information. The  following contact types are required: Registrant, Administrative, Technical, Billing. As per  standing policy, the contact data will displayed in the .IN WHOIS, except for the Billing  contact data, which is not displayed.
•  Nameservers: to register a .IN domain, the registrant does not need to provide  nameservers. In order to appear in the zone file and resolve on the Internet, at least one  (1) valid nameserver must be associated with the domain name. The use of at least two  valid nameservers is highly recommended.

RESERVED NAMES

The government has reserved a list of names for government and registry use.
http://www.inregistry.in/policies/reserved_names