SD Domain  is Sudan Country Code Top Level Domain Name "ccTLD" according to ISO 3166 List.
Sudan Internet Society "SIS"  Manages, Maintains  Sudan ccTLD Domain Registration .

Sudan Internet Society "SIS" is a non-Governmental, Technical and Professional Organization.
 
Sudan Internet Society "SIS" has been established as a result of the rapid growth of Internet services in Sudan, and an increasing need for a forefront, supportive body that emerged. The Society is to serve the Sudanese community and provide leadership in addressing key issues about the roles and uses of the Internet.

Sudan Internet Society "SIS" Web Site