Links to international communications regulators, telephone numbering authorities, and related international telephony information.

• India
• United States / North America
• Canada
• Singapore
• Other resources

India

The two primary agencies responsible for regulating and managing India's telecom sector are the DOT and TRAI.

• India Department of Telecommunications - DOT is responsible for national telecom policy and licensing as well as development and investment in the telecom industry.
• Telecom Regulatory Authority of India - TRAI is responsible for regulation of landline, mobile, internet, and other communications providers.
• India National Numbering Plan [large pdf] - This plan published 2003 by DOT provides detailed information on telephone numbering throughout India.
• Study Paper on the National Numbering Plan [pdf] - Study published Apr 2009 by TRAI that provides some recommended changes to the National Numbering Plan.
• India Calling Info - Additional India telecom industry links.

United States / North America

• North American Numbering Plan Administrator - NANPA is the administrator for telephone numbers in North America, including numerous Caribbean and other smaller countries that are members of the North American Numbering Plan.
• USA area codes search
• USA area code maps
• US national area code map (with time zones)
• US Federal Communications Commission

Canada

• Canadian Numbering Administrator - CNA manages Canadian phone numbers consistent with the guidelines of the North American Numbering Plan.
• Canada area codes map
• Canadian Radio-television and Telecommunications Commission (CRTC)

Singapore

• Infocomm Development Authority of Singapore - IDA is the telecom regulator for Singapore.
• Singapore National Numbering Plan [large pdf] - Official Singapore telephone numbering plan published in 2006.

Other Resources

• International telecom regulators - Extensive list of telecom regulators for countries around the world from Cellular News
• International Telecommunication Union (ITU)
• Japan: Ministry of Internal Affairs and Communications (MIC)
• Hong Kong: Office of the Telecommunications Authority
• UK: Office of Communications (Ofcom)