What region code does region A belongs to?

Blu-ray Region A includes most American and Southeast Asian countries, as well as some East Asian countries including Hong Kong, Japan, Korea, Macau and Taiwan.

DVD Region 1 includes United States, Canada, Bermuda, Caribbean, U.S. territories.

DVD Region 2 includes Europe, Middle East, Japan, South Africa, Swaziland, Lesotho, Greenland, British Overseas Territories, British Crown Dependencies, French Overseas departments and territories.

DVD Region 3 includes Southeast Asia, South Korea, Taiwan, Hong Kong, Macau.

There is no single one to one correspondence between them.