Foreigner who wants to enter India must have a valid visa affixed on his or her passport, except for nationals of Bhutan and Nepal, who may carry only suitable means of identification. Tourist visas are issued for one month, six months or five years, granted for the purpose of a visit. Details and types of visa can be obtained from Indian Embassy or Consulate in their respective Countries. Foreigners traveling in a group (at least 4 persons) can apply for collective visa under a recognized travel agent.
 
Foreign Tourists who wish to stay in India beyond the visa period should apply for extension of 3 months; before his residential permit is due to expire. Extensions are routinely issued at the Foreigners' Registration Offices in all metropolitan cities and in all state and district capitals at the office of the Superintendent of police. 
 
Foreigners coming to India on tourist visas for 6 months or a shorter period are not required to register themselves with any authority in India. They can move around freely in the country, except to restricted and protected areas. 

Protected Areas

Special permits may be required additionally to visit certain areas of the country. Parts of Sikkim and the north-east frontier states are out of bounds for foreign nationals. Permits are normally provided to tourists for a limited period and may obtained from Indian Missions abroad or Govt. Agencies within India.

Permit for travel to Andaman & Nikobar Islands and Lakshadweep Islands can be obtained from mainland nearest to the destination.