.com.sg For commercial entities which are either registered are registered with the Registry of Companies and Businesses, IE Singapore or any professional body. .net Represents "network", and is most commonly used by Internet service providers, Web-hosting companies or other businesses that are directly involved in the infrastructure of the Internet.

.sg For individuals and commercial entities which possess a valid Singapore postal address. Foreign nationals may apply for a domain name in this category provided that a local agent with a valid Singapore postal address is appointed as the point of contact.

.net.sg For network providers and info-com operators in Singapore. Applicants must posses a valid licence issued by the Info-Communications Development Authority (IDA).

.org.sg For non-profit organisations which are registered with the Registry of Societies (ROS).

.edu.sg For educational institutions. Applicants must be educational institutions registered with the Ministry of Education (MOE), Singapore.

.per.sg For the registration of personal domain names. Registrant must be Singaporean citizen or permanent resident above 21 years. Registrant below the age of 21 may apply with consent from parents or guardian.